Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1798860812e5af7…

MALICIOUS

PDF

71.6 KB Created: 2021-09-05 22:34:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 05625e1b43391ce5886e0856eedb92ae SHA-1: 90fe12a33c222a2b5e1caf64a9e340d8dff595f2 SHA-256: e1798860812e5af728fcd178e88123868937af8103e12f6f358e638abd4a5860
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Several heuristics indicate the PDF contains numerous external links, many pointing to potentially compromised CMS upload directories. While no executable scripts were extracted, the PDF structure and link farm behavior suggest it's designed to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://grupo-bahia-real-estate.com/ckfinder/userfiles/files/70402811217.pdf In PDF document text
    • https://flavio-tonon.it/public/file/xuwiber.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/logatipetebabebil.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/lonibaxi.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/17569079959.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bea2a3b45d0---54713404052.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/1691fc56fa4ab7500ece32375b4e4547/91215233217.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/vemog.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/b37983a491e526c6a72e52415d271c10/74104056019.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/v0blg1k91vscodddsjupup4r4g/22451455233.pdfIn PDF document text
    • https://ive-cal.it/file/93729878301.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/76fbb28a2df400958c5524b7a31b4279/wowamudojex.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/11563495125.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160b393d18b457---68326947053.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/lirawitufi.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/e3840ac17d8b77971f98776063d320d3/9492158210.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/3fb817640ed9bd93a1dd1746008e8572/gevuf.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/1b6c801e9358769242d60998c48c4fe7/buwagi.pdfIn PDF document text
    • http://krasneclanky.cz/uploads/96608675581.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/mllem20lcvrapkdoc5qdjatqo6/zojodorekit.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ab31f9c7f76---57668478312.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/bufizoguwojed.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed74edcd42---52934664458.pdfIn PDF document text
    • http://op-gold.com/ck_image//files/balibotegetu.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/ks6sobu3oitqia193cjsseqnb3/rivunarasubax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=malicious+code-viruses+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_off0000b6d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6D6 16764 bytes
SHA-256: 3bc44510674f68f1276893e680783cc3c050c9a30d88f4dccf41eeb4f8370c54
font_01_sfnt_off0000e009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE009 10604 bytes
SHA-256: 46eed926713fb2025600f2ee97b23a0c41e11e2ab26fb2a90cf034161a5c1d29
font_02_sfnt_off0000f873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF873 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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