Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c758995e3fe7bce…

MALICIOUS

PDF

72.9 KB Created: 2021-08-29 21:16:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 87cbcb248522e03e7a9fe52c43d98cfb SHA-1: 7e83feb933304957f62c3dc829e5b47d5ba2312d SHA-256: 6c758995e3fe7bcee8b4f1000646802cf50e4f497f739af23f5810c424f2a8ed
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm hosted on compromised CMS upload storage and disposable hosting, with numerous distinct hosts. The embedded URLs likely lead to phishing sites or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/72134514755.pdf In PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/65318ebca1cbb752bb8e906126b5bcdf/lemoruselabudipemuli.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093facda2cc2---kokilowi.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/ouh7j4ptqrmnb3q5dmj85o9jq4/34828795893.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1608f602bad578---94862102797.pdfIn PDF document text
    • http://protok.pro/upload/files/13206950847.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/44937513738.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/dd5d8d8c440a2593bfa17f2e3e93243a/futatirovelot.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/96800921548.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087b60896900---58340027719.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/37853810219.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/96866592884.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/wevaxetef.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/80670071317.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/673684b0c4275f817f930ccd755b362b/2479989005.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/02dbbb4f25559a91568fb8364ecda785/kiwuzuwekubibitudo.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5eadd0536b---ruzumelu.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df73deddaa---54074620382.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3d9d736a6---dawalogowumukag.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/gojamuzujejerujitoluw.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/88f6b91ae3815611f5f823a112fd4bcb/97044197595.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/zilokarimopa.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/73f3c338123afcad57cb063af8378375/23935920871.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=32cm+x+25cm+in+inchesPDF 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_off0000bc8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC8F 10400 bytes
SHA-256: 08fc9fb55ab990fde5955d2665b4634864cd89ec203de38943b0a26ee8cd55c1
font_01_sfnt_off0000d3ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFF 15728 bytes
SHA-256: a89253adcc756da969b83845d9d8cf50adc99fab48c4bd0a95abb5cc82f60ee4

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