Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a05155e926a63c4…

MALICIOUS

PDF

91.2 KB Created: 2021-07-19 19:06:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d24e302e757cf1bf35674a7a7f9c5fa0 SHA-1: d96cb7c34e3f323ab0cea94534f15779d2264eca SHA-256: 9a05155e926a63c400f02e9a12326ded35d9cc87a5a450772aa986358a993739
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Forge Credentials

The sample is a PDF document that exhibits characteristics of a phishing lure, specifically targeting Multi-Factor Authentication (MFA) or one-time codes. The presence of numerous links to potentially compromised websites and the ML classifier's high confidence score indicate malicious intent. While no scripts were explicitly extracted, the document's structure and heuristic firings strongly suggest it's designed to trick users into revealing sensitive authentication details.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://vodnik48.ru/content/file/82114779770.pdf In PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/0d24abcc4f319b32b8b68058e23b13ed/61360951597.pdfIn PDF document text
    • http://spearsyounglegacy.com/clients/b/b2/b2c23f164518415ec8f3c1c8d0af542d/File/86614412135.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/814c0fa5803033f6dcabac4201c23f98/53742067437.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/pojipo.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/573548f2c9f81e02569a3fb3de83f4a4/lisobiterozakovewapen.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7b9290fcb---vamezukixeninogo.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/solfdfs97acjmdg66nf0d9spm0/zizovukiloke.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/5976b2ecfdde01b2972ccd674877300d/81977838887.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dbf99b59964---75054103407.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/3e0333a4bbd5f888fa3df59d5833950a/gonuwirujikigaxisele.pdfIn PDF document text
    • https://kompaspt1.com/contents//files/97830857733.pdfIn PDF document text
    • http://nguyenquangcomputer.com/upload/ck/files/xitopogebabud.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a605f97a1fa---88923778089.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de4a4cd82d6---negumib.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce835a371e---50990810149.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/d77ee9083a78ad4f265231467bb64f86/gabovajoziwixobuwagen.pdfIn PDF document text
    • https://groupburuemas1.com/contents//files/55234358248.pdfIn PDF document text
    • https://egf.tw/test2/images/file/26204806616.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9bc8872781---94545719782.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a91db1cbf40---pujelisefebutaxojunirovo.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/120187610260968ac14293e.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076f60e12abc---wukinawirupamudifu.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/86dc7148073dd0f1b7dc4b4e0c42d21f/fitejomiwelixis.pdfIn PDF document text
    • http://taiyoaquris.cn/upload/userfiles/files/20210627220557.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=step+by+step+doodle+art+for+beginnersPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001012e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11940 17216 bytes
SHA-256: bef945d109d99ae6bd94e3b6ef54fcee15dc029f6306cffcdf9ecfcdeffa024a
font_02_sfnt_off000145f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145F9 11004 bytes
SHA-256: 0939c7792147be856b49ed94db4517593c39d6b96ce476b4bc3494721e0adb47

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