Malicious PDF — malware analysis report

Static analysis result for SHA-256 1136c12971392e72…

MALICIOUS

PDF

80.1 KB Created: 2021-09-03 04:55:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0870e3a11760ec5aade44d933a75c551 SHA-1: c81b2fa3ac764a7d2c30f106687bac8639218a10 SHA-256: 1136c12971392e72934e832ff101a5dcaf47ea56b44ca60c7d3513fd0e17c465
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://cke.hk/userfiles/96342739455.pdf In PDF document text
    • http://liga-stf.ru/i/upload/files/56258235400.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/6500a48b2ae34479227f3112804cecef/xibuzinipepaluj.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/ppq8f0u3a6pogqkjcsl1v5m1ha/jegamaj.pdfIn PDF document text
    • http://lovesenergy.com/file/38106833169.pdfIn PDF document text
    • http://drlalashow.com/php/billboard/uploads/file/97001975466.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd0a30c64b5---8667800785.pdfIn PDF document text
    • http://tomdythai.com/userfiles/files/11302731427.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/13279204702.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096784a9e1b3---bodatukibewefosig.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/fukelowa.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb902aaf6a---dajimasirukokeku.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/11606593146.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116692f5758d---55316895724.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a52c89c903e---19509352607.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/vixefefemow.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/94607931051.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/34906838140.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/sabepi.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/n7vl2d8s9dv97qdram5g3hm92u/60416319050.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/f6rra9q1guj330vvlbr1945061/kijelibinuke.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/u9n40kfia2e0sjfge18uslf5ag/bejiwivuxakuxisubixinusuw.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/fn06vvj3qhscn6hlurri2j6rtq/nilamabenelogetalo.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/2e7f9aec1da2e01c303b78319d2a8482/zatunukiremax.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/dulanefem.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/36283585888.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=manual+da+lava+lou%C3%A7a+brastemp+solution+8+servi%C3%A7osPDF 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_off0000cd41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD41 18444 bytes
SHA-256: 4e1cd1fc75f2fee6386e8c8d88d047eb2599268edba591aa2ad48a7607bad5b1
font_01_sfnt_off0000fd7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11592 11260 bytes
SHA-256: a99b698bd08dda0a5508549652a86d106eb7fd4860bb599ee6d23bb7c2419082

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