Malicious PDF — malware analysis report

Static analysis result for SHA-256 36ebfc8377eda3df…

MALICIOUS

PDF

90.1 KB Created: 2021-07-03 01:05:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f495bc37670fe0c077a31a0dea757dae SHA-1: c271957f23e643d0fde629b93c089d2cb9704526 SHA-256: 36ebfc8377eda3dfcdb9250b4d4be9c23a2e8997146eae613d9516744ad41f05
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting it's used to host malicious content or phishing pages. The PDF itself contains obfuscated content, but the presence of numerous links to potentially compromised domains strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160aec99053474---dakekovejew.pdf In PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087311a370e2---xuxereze.pdfIn PDF document text
    • https://soechi.net/userfiles/file/nenivanobo.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/24krd3g0rtejs6eihvh1tm1va3/95516527917.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/pivunexevaxeg.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/81a35b2d86631e145ff1fe44b3748ba2/39421114464.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/xusubuliniwaw.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/mujujigesonabakebuperebeg.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/35091293094.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099351e86827---29975409521.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/jusivim.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/20317511907.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/mv0ao7ig6de9ho1i04ne6h2ca1/vefimamikaritavekubebiza.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/70974189092.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e835fc1210---zebosotoka.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/5nv6l2sjvt5bud4eq0g4bf0vhp/58469762733.pdfIn PDF document text
    • https://hgb.se/filer/file/wuduri.pdfIn PDF document text
    • http://0965818789.com/CKEdit/upload/files/pibizibikij.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4774eef8b---43694285465.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/motisuwomasadotorogat.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/8113631802.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8a8bdec3a---28556892007.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1cd62ebfe---78156271431.pdfIn PDF document text
    • http://nebo52.ru/uploads/files/raweluxalufufif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=intentional+teaching+strategies+early+childhood+examplesPDF 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_off0000fcd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD2 17100 bytes
SHA-256: f3cc85da17620cbc06384ff4f36ea3cc8458562582deac702f35b0b28b73d77c
font_01_sfnt_off00012915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12915 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001412c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1412C 11128 bytes
SHA-256: d379978ce0c83131e4b5bab85c346dd1a393bffeb862c24b99130abee3f03c3f

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