Malicious PDF — malware analysis report

Static analysis result for SHA-256 f677d6a21c282757…

MALICIOUS

PDF

86.8 KB Created: 2021-06-26 20:42:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: c44dc35c8983f2e3422b190a663a4411 SHA-1: 2f96c22013f6f2402c5293787baf2d57ef88e44c SHA-256: f677d6a21c28275741c61fa8eeca4c8f18e309eed1ddf3b8cc5e59bb72257898
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, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple compromised websites and potentially disposable hosting. The embedded URLs, such as http://daotaoyduoc.org/..., suggest a pattern of hosting malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aec2951e3c3---sedikinam.pdf In PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/31hh9toe0mfuukfth2boh1ac2i/ribakugepikijujapogekusaj.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/fid66537mufdg7fo6vf5pp2t6k/xuzelibeta.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b10023e3e3f---33479156100.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/ba591287318d177b6df6d0867c119566/tovini.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/rbab7f2l3ebukifdpo8kkqmh60/vabivusuwapisa.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/48a31d6675aeb5ffbeffe963b4a2ee2f/zopotuxesosinojefupiteker.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/rinozexo.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/70922111701.pdfIn PDF document text
    • http://atya.eu/files/file/ninak.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4ab8b1510---54030155389.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/4f3863f358033bc5827cbd8c56f08bb5/puzubunaba.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a622528742e---98541290868.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/c874759d07c49441a7cc7618a55a7fdf/jovomanikux.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/40403499830.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/l8a6qtfscdlv6bntla5qd11bu2/50345660332.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b261e9634ce---zoxodolukeraberolope.pdfIn PDF document text
    • http://gaskinfamilyreunion.com/clients/b/b7/b798c9f9e2af69c3a5b950a06e4ade8e/File/xeroruwexiv.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16099fe0ca359b---direzuxiduvegijomoxiweg.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/domelap.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095d90a65db3---dobiveremuset.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d469359e3---48631001503.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=online+exam+answersPDF 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_off0000f126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF126 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001093d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093D 10264 bytes
SHA-256: 1996fb76dce6061612fc4a4bd24c30842e8a1df13e0a387aa9081824fc52683b
font_02_sfnt_off00012059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12059 17108 bytes
SHA-256: 02bb720a9c422212ab77e52c1e2ad82c82dad67657a0794699218dd2c1800138

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