Malicious PDF — malware analysis report

Static analysis result for SHA-256 96a9a2b6734835a1…

MALICIOUS

PDF

86.8 KB Created: 2021-07-23 09:44:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 09e37a42762077233a28ea6c7239d875 SHA-1: f19ebb923cacc232ac843b6aefe4413826ecce24 SHA-256: 96a9a2b6734835a10f28abfea24425ab11222d4def56b0f6e96119cd984ec10d
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which are hosted on disposable or compromised WordPress upload storage. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest an attempt to redirect the user to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://metall-press.ru/files/73356828447.pdf In PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210629_23858CCEE5814387.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/faaa8c24b448f16e9dc6aff2683ee459/ledibokawikir.pdfIn PDF document text
    • http://schubert-hh.de/image/file/nobalosidewofog.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/981ed026a751ba245a87fa8f424e4b96/kiravarubofetolexebatu.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/c38ecfc8132bd40b5914fbe12b84d574/53256031142.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/b083f2db6f68e2ddb6a5d9b36813bd57/605070432.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/rimijuv.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/pr7da8qemnne5qs7sneu12ane3/42751743598.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd4b3da92b---loketapu.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/c067f4c7c69e539dee4389d0a25a5681/xuwijox.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/ap0js713qcq5qgb6nm3sv71kf1/nodibewevofaxekifototogi.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/64d45806f711ea17cf158ce6cb73db89/44582778838.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/83915043895.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/bijorejivufevosat.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/ld2f1an5rq8b102megejv379c4/rovigiwujanareriwidegiduv.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/27451559738.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/gefarazakalinisakid.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/714e6977eba29c421f920587c85601b7/66485863913.pdfIn PDF document text
    • https://ev-owners.jp/userfiles//files/tivesaxufatug.pdfIn PDF document text
    • http://abpaluso.com/upload/file/49937319818.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/21d988697c076b3e147337511168c421/susadamuwuzed.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/fizuvugunofasalogag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=leasehold+property+definitionPDF 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_off0000ef77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10789 17124 bytes
SHA-256: 280fd601415047d8deb161b0ffabee67d8fb5211628a407fb8bdcb2029768de3
font_02_sfnt_off00013477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13477 10664 bytes
SHA-256: 2b125791f061fe94dc0720821c0f92e82daa8983c0ad0297db8df444603e3936

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