Malicious PDF — malware analysis report

Static analysis result for SHA-256 189feab79eac995d…

MALICIOUS

PDF

106.6 KB Created: 2021-08-15 08:54:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 336a420b9c358f7c9ece24bafc971048 SHA-1: 5bb50272766f9bc0a5402ac47bb39c04a92e12a2 SHA-256: 189feab79eac995d7cd0d95178a1d5fcfeea327397cb01462b2ebdee4074f1b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of numerous URLs points to an attempt to lead the user to a malicious second stage.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9630

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://oniceh.ru/uplcv?utm_term=direct+and+indirect+speech+exercises+pdf+with+answers PDF link annotation
    • http://universe-micro.com/upload/files/20210730_013738.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/95613476319.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/7ca5c7821f3249f14a7d6b5f1b55a088/1546531189.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/29491239400.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/aa2b00da054851b635d78b64fd84ff97/14426651171.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/puziwareg.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/15843029112.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/ea8b0ff0b8ae65d6e12224548e99358d/refusafowenimigadeto.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac567f32261---juvabe.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096288a50d0e---25729079359.pdfIn PDF document text
    • https://quangcaoxetaxi.vn/upload/fck/file/vikijawuwage.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160afcd0a9d231---noxaxapizesaviwamu.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/53759149529.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/fe6d27b7635347571ef19452f4244c8c/39346261277.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210610174306.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/sri5u8hjbcl4oueqgib6l0q88s/mukumon.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/xelugijutewu.pdfIn PDF document text
    • http://elm3rad.com/file/49633462264.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/ee1116466fca9b4d4694b550c887ec98/tiloxaxedopinisotusaguku.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/63663554868.pdfIn PDF document text
    • https://badoza.net/userfiles/file/16226001731.pdfIn PDF document text
    • http://darienhigh69.com/clients/866565/File/86814703783.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/f0beca7c3f9a167330f9938ff19dbafd/mosibez.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16100ea95ea290---famujinen.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/11caeb53244bdc7addaf8bc43db6a0d4/49957617551.pdfIn PDF document text
    • http://orderkai.com/uploads/files/putavipupejibafoximava.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011ac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000132d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D9 10740 bytes
SHA-256: 43a104d16c9045f65660053d89b8c76127a08b133a83aff653745b3aee604e8c
font_02_sfnt_off00014b8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B8E 17812 bytes
SHA-256: 81e1a4ba29cd0a164c88dde061faaa8ee7430a0facda4c3f5dde54d95c45714e
font_03_sfnt_off000179fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179FC 20756 bytes
SHA-256: 5931bf2b7a55c9032c54eefde5c0f665f0ef376faeea6ae41133b070497de980

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