Malicious PDF — malware analysis report

Static analysis result for SHA-256 7626262c718bc820…

MALICIOUS

PDF

78.7 KB Created: 2021-07-23 00:22:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fa1dbee8ef5ccc398ce5b4109b6cc531 SHA-1: 483ccc1ba6ca912e77b5a75aab4d5be6dd1f947a SHA-256: 7626262c718bc820cf204caf515f19da344b6f7a82b7ec9feee19f04cd06cf63
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to lure users to potentially malicious content. The PDF's structure and the nature of the embedded URLs strongly suggest it is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/5e55c172a14abcf1347a7c6d65ec4363/17080571247.pdf In PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d48a19d17---sebipipivobepunoneza.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/lirakusenasoneripata.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073929045aa7---3298762413.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/53472652164.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/42743bd14c3322e3f0fdbd2d858e5948/95168339272.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/gvpl1uiom385v16ee7ttbu3b02/xerevelelazasop.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/aapiklb892ood7e2631ldk80o8/62090648511.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0648ee94b---zixometubixesujutuvu.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7c6204c32---sanisoxuponifufuzugi.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16082e1287837d---31000740698.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097479fc76b0---34422054039.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/e5l3o3fj2k4kkodgia8orft2ip/47623845878.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/rilebuvefexerigegogaki.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/da886629f17f3bd978c00435e684e637/52674433864.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/vozosemiwuropofidefawo.pdfIn PDF document text
    • http://packamate.com/userfiles/34380478623.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aabcfe1ff73---tiperukemo.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/tafalusagerup.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/abf73543ac2c6bf4d1d982f4ddf097c7/mewubebikudokilevige.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/6a8b519ddcf63cff54bfe39acb240ea1/xavewali.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/6811472246.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/18930313295.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/gugodixunumikaxoderuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=woocommerce+show+sku+on+product+pagePDF 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_off0000ca86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE298 17596 bytes
SHA-256: d7ff21b38004bbd5c17b3c17fcc13843c36b6e352a898952a6c81707aa42a85c
font_02_sfnt_off00011158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11158 11092 bytes
SHA-256: 19234b9a06c38260d2b165ce3b067c3593f945ded8bd975fa02e6ba00d79820c

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