Malicious PDF — malware analysis report

Static analysis result for SHA-256 41df286dde3487e8…

MALICIOUS

PDF

157.7 KB Created: 2021-08-18 21:42:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: e9314e8800998a63ca17a5b4be69c1b7 SHA-1: f192a2c60e5945063df243d06e42197da37d5e0d SHA-256: 41df286dde3487e8335368ca14f71899a29bb7100359637c0cc7245eccc85418
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised WordPress installations. The presence of numerous URLs, including those with 'utm_term' parameters, suggests an attempt to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9607

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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 https://cructi.ru/uplcv?utm_term=what+are+the+ten+commandments+of+god+in+the+bible PDF link annotation
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a26d82d4b54---5688407197.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/45833827677.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071df469e542---nazatuxomumodozelireta.pdfIn PDF document text
    • https://scalper.ir/data/files/file/326551531.pdfIn PDF document text
    • http://wisewood50th.com/clients/3/35/35ca2b70ae131fa39667c240906a3fe4/File/ziribewadojumogub.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/pufiwexeburonafuxekudiwe.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851345cca3e---lukoxojojogemixuxaf.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/7a55e0beb845ce5e3d5ec83ba22fa194/zitilewif.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/56478d9e80e391279e26e9dd4cc3cae9/rilorokefujesobavapav.pdfIn PDF document text
    • https://kaptenhoki.com/contents//files/fupekajokemav.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/zubesazezaroles.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/mavimumurenem.pdfIn PDF document text
    • https://facade-metal.ch/ckfinder/userfiles/files/zabevajaga.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/47122020901.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a12a8f24026---16930736981.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/68102122273.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/72712374690.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/75516279586.pdfIn PDF document text
    • http://winso.tw/userfiles/file/muzijaxesusevuritej.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16088ee8a2fbd6---zekukasulil.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/82703418534.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42664538106.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608068465d5f0---majexazusabolato.pdfIn PDF document text
    • http://gtshotel.it/images/file/61210985741.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001e19d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E19D 22136 bytes
SHA-256: b4df7f796a59ac3b46eef84497805cdba0a71bb6fec15e5271c3562404d16b26
font_01_sfnt_off00021859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21859 18228 bytes
SHA-256: b46c5cf57904eb2daa968e7fb27eb33ece19e5467d9ceef155be0088f4b0014c
font_02_sfnt_off00023570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23570 11056 bytes
SHA-256: 60de8c8ea8cf2655ba8a344403dfd9948519acf1a21222f0336781fe254963dd
font_03_sfnt_off00024ec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24EC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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