Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dc21a63aefd3e04…

MALICIOUS

PDF

84.8 KB Created: 2021-07-09 06:20:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: baa313563ed8c1beef9d55f6da7460cc SHA-1: f2f784694135206ca48c072ac608beb979c8595f SHA-256: 0dc21a63aefd3e048014ded9200113772139f3d5f30c7df92d0940e450e84c0b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains, likely serving as a distribution point for phishing or malware. The presence of external URI heuristics and the compromised CMS upload link farm further support its role in potentially leading users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crewmak.ru/uplcv?utm_term=hoover+steamvac+gold+manual PDF link annotation
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/00b2071982b3150d74a9922900c4b3ed/81205360228.pdfIn PDF document text
    • http://learningkey.org/userfiles/68547518365.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/8d644954e5e4d64783d6991405b1ffa3/xipogosuxapapavivakekenaj.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/likig.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087e648261f1---90875842503.pdfIn PDF document text
    • http://sparkpro.lv/content/file/2340324368.pdfIn PDF document text
    • http://jfe.hk/userfiles/83878061884.pdfIn PDF document text
    • http://thejosephinebryantfamily.com/clients/48776/File/bixenujomurinenisigo.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a065dd24cf2---monew.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/jululuxebiwa.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609728377649a---67810587523.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/05c50536f7517a432180d2f68f346972/zasumogujupi.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/80839440789.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/b9b26f09a885bf78cab9d4685a705e32/wixeni.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/0c4dd01cf3bb96ea509716f0479688fe/sozevexije.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/gobipozi.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/781b8ce1d86cc705378fc560525db922/xinipopu.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/papakukawopigog.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/dagadolunemivu.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/60792989398.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608323eabdbfd---tokozetunub.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9536b7f358---supog.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16075f763c92b7---bofefapazukonotovolukak.pdfIn PDF document text
    • https://brs.jo/userfiles/files/kifasutafe.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE655 17848 bytes
SHA-256: 6a937d9d546c7c06c7122665d3846350b24796b9f4c240a622c75725cfda1973
font_01_sfnt_off00011581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11581 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D98 10776 bytes
SHA-256: 03ab7fc17e3da50e2556314eeeb33a0c239a734b6a2ac33f58b82439c0c29b36

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