Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7834b1cd2e32721…

MALICIOUS

PDF

68.8 KB Created: 2021-10-03 18:07:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e67248e5ec085c2e3455cedf62de422e SHA-1: 2be33b24ba674803f34eb1901fcddd12571e112b SHA-256: c7834b1cd2e32721de9fbfceaa5a0c491990440386d988bd9646d066d1c0e86e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and appears to be a screenshot, a common tactic to hide clickable elements.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://zespolbahamas.pl/zdjecia/file/kizibodunupadonojatukut.pdf In PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/69578682081.pdfIn PDF document text
    • http://www.springperfect.com/upload/finder/files/robefosekunirufedoxiwatur.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/wijadiwaj.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/xurakomapoda.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/lekukesem.pdfIn PDF document text
    • http://premiumdrinks.eu/userfiles/duliludekupokureniw.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/gebuf.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/miwejuludixugosapi.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/ba77a62221c102ecc92cc7b47b3f8f2e/96873725914.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/6963258338.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/lsirr1k75ki7ct87eemcmc9q7d/26255130886.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153f36d52cce---41091565787.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/18208030787.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147246e3ee7f---39163164158.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/ginopafazamidimifilobupeg.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/wutepuzagovab.pdfIn PDF document text
    • http://wirtrauenuns.ch/images/file/4830739466.pdfIn PDF document text
    • https://kaptenhoki.org/contents/files/96790109735.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16149100aa93c1---lanavofonidifikuf.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fisolemamekagafagubofani.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/guxitowirupumozuzite.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148afc1c63a7---73334221649.pdfIn PDF document text
    • https://www.netcorp.hu/data/editorfile/7023946081.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=closing+statement+in+court+examplePDF 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_off0000b08c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB08C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A3 10952 bytes
SHA-256: 41f70a01f5f1dfa0f49023bfcdcc3de01025a8086a67e9970f2f4600a25194bd
font_02_sfnt_off0000e20b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20B 14144 bytes
SHA-256: 85c9aa67cc89c1c12e6b2e18fe4dc4b045aef8d8b0c985795a03a9a90a6047c6