Malicious PDF — malware analysis report

Static analysis result for SHA-256 38b8c51a52dccbb9…

MALICIOUS

PDF

118.9 KB Created: 2021-07-02 11:34:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f5d7a3ccb0bd9b923864bab757567b28 SHA-1: 924d5cff66f69125427133471ed2797c96bc5314 SHA-256: 38b8c51a52dccbb9c125d62cb1070d7062ee7e3710836f753b45a404cfc57088
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 numerous distinct hosts, many of which appear to be compromised CMS uploads or disposable hosting. The presence of a PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the conclusion that this document is designed to lure users to external sites. No scripts were extracted, but the overall structure suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9267

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://tedvandergulik.nl/userimages/file/kezadefu.pdf In PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/nuxufavo.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/afg1uj95977pqotn3kf92d3em3/13079338561.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b62b48245e---soladojupozis.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/57081697619.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607edce0ac0cc---dizusojog.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a08fbe0d2a5---10292468446.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad3e58a3d6---56717520183.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f79cf18e0c---12041918048.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b63b04cf1d---3354877888.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ea4b55793---gigisuvekulutolu.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/85340253935.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/zufida.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/fd477881fde753f4427e1f056e9f5d17/delujefifakar.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c71063b936b---73257967083.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/2021621142755511.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b02ea77324---vipisizoriruzikafabo.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/40374036429.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb207fd4ff9---64801117395.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/gvum0s2tbvcfsu7qthg1jalqjf/17653532325.pdfIn PDF document text
    • http://nw-line.ru/generic/uploaded/kenodiwatubel.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/70571330075.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebf8a25f30---3984711005.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/eef3a089546257f1c2d57b8fb05a2800/bafivujajubo.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/boduxebitabopen.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16088a50a6fb1a---91765039962.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=synonyms+and+antonyms+css+past+papers+pdfPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE822 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10030 40404 bytes
SHA-256: f9758a0b5db9825796e79d5eec04263083f044996baaf4201d5c31cbd3e678e1
font_02_sfnt_off00017179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17179 17220 bytes
SHA-256: 9b77444d192ab1b0cb106b74b25b3f82efa57698aaef4b5a104646cbfbb1f1c6
font_03_sfnt_off00019e87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E87 10832 bytes
SHA-256: b55cc78745087dda90cb3c383547a763805c6d88fce9631c13374ab0557bd077
font_04_sfnt_off0001b78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B78A 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd

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