Malicious PDF — malware analysis report

Static analysis result for SHA-256 d94e29a33d870ab3…

MALICIOUS

PDF

82.3 KB Created: 2021-09-03 05:56:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 932962da662fd51dc604a9ed3eaca518 SHA-1: 904d924cfb3e459e253e1296fa787673a36aec26 SHA-256: d94e29a33d870ab3ba50bb64d8adc08a59c1427f599ae44f13f08c83ff0cf870
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to potentially malicious content or phishing sites. The presence of multiple distinct hosts and a high number of links per host indicates a coordinated effort to distribute malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072b70b494c0---puxaxopu.pdf In PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/34151020462.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160875c350e95e---46160049696.pdfIn PDF document text
    • http://orthopediedelft.eu/files/47347729883.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/sifubixorew.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/071bd7e2dd5d903afe63a4342c76d63c/99438680724.pdfIn PDF document text
    • https://szallas-karpatalja.net/upload/nedejimava.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/af3octncrb1p428tf9o0brn4o6/towejawavetop.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/733877c97b0e51d2b86992889ad4ecc7/mikojarewupebadojabadekew.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/le61q95l8obm8f1mqshvtkgnjj/ratis.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/30484514625.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/7b72248fcfdc0771cde4ed6aa010d6ab/91185698638.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/49700517220.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/18097799291.pdfIn PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/worefur.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/vemog.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1eea58929---zolux.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/3568311023.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/wedifafijivirilibud.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/4240c7165268d69ed9fb141147cb169c/55536171635.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118d4a986b2e---62986549614.pdfIn PDF document text
    • https://lasanisports.com/files/2096811030.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/68182928870.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1eefa31aa2---48025430643.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/6f5c4lrn9ammd3somtdh2rqvq7/velividazodudural.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=idiomatic+expressions+list+and+meaning+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFF 11016 bytes
SHA-256: cac632d8652d238ece00f426e33a9a5162295468bd6ee3dc4fc0c459d91e90e2
font_01_sfnt_off0000f45b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45B 18256 bytes
SHA-256: 2603aa1eeec3a9a6566df07af7d0bdc195631b188eb49ae01f3d3f097f924677
font_02_sfnt_off00012350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12350 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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