Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b7b9f0f4d6c605d…

MALICIOUS

PDF

85.3 KB Created: 2021-06-26 02:27:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 98b7c618779479a61c331440b0aae329 SHA-1: 64c7a05acc6f8555d8000cd209f5f11754828300 SHA-256: 1b7b9f0f4d6c605d9d1aeb368179ae3b8b96a95c849a6d06198388952c1ee563
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan payload. The document contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to obscure the final malicious destination. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it is designed to trick users into clicking these links, likely to download a second-stage payload or lead to a phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/5000f6ae6b94c522282a13ef022cd903/tivamaxiju.pdf In PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/88424501189.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16233901661873.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/7vmuk1b4n5vgfmrb8hfa0mgg2s/jololalisixag.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/44782139411.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1eede9ee5---pegatamebovobomaropuvusi.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1622789110.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/rokumage.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/e4iv69gqve9ksmclvp4845bhj3/74690169813.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609185d5c59ef---kodosexowijinonazokonowop.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/mozepedavojutigofur.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/92207748576.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/71d2216616a973a171485e14d77719d9/livujuzonilafopog.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078724e0ba38---68332249121.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/c33f1f2f42d63e643515585000b06484/1404554777.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c46c10d207d---pusoxasimoxazafalamu.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7c603a7ad---13706134712.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5207eec35f---zemolabikeda.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ed18eea9a---14794552218.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/go5fsj2k8titlrkbltvgegpbv9/sulunojilime.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/076cc5215f29f87d98f9f0feb64fe550/93518015541.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=ralph+h+petrucci+general+chemistryPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99B 4028 bytes
SHA-256: 685c6255667da597e07463aeb60152a6caaa9192a95d97d7a31680c69eca8f58
font_01_sfnt_off0000e85c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10073 10960 bytes
SHA-256: 20df10db7fb383e17c9f5da1a6e82980f17a61dc45d9c9f2063d1c2f1b2934ca
font_03_sfnt_off000119b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B9 17372 bytes
SHA-256: 7e91d1c6a11efd11e84571c00caa8531e724cc6b5ab2b321bc21472810efc36a

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