Malicious PDF — malware analysis report

Static analysis result for SHA-256 df5c580fa099c301…

MALICIOUS

PDF

85.3 KB Created: 2021-09-21 01:43:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 083d7d0cea5ca2012eaf1fb3d98166f4 SHA-1: 0d21d130ac39c329b5b55c13b5562f161f98c29b SHA-256: df5c580fa099c301e5f29c09bc52885afe1322ccf9cb3f171e25ac7d28e7b04d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous links, many hosted on compromised or disposable domains, indicates a link farm designed to redirect users to malicious content. The 'SE_CALLBACK_LURE' heuristic suggests a phishing or tech-support scam pretext, further supported by the overall structure of the document pointing to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://craj-ops.craj.cz/soubory/40960053085.pdf In PDF document text
    • https://jdsliquorlocker.com/nbloom/fckuploads/file/11192772220.pdfIn PDF document text
    • http://zhxndl.com/uploadfiles/files/kiniv.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/fanarif.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/fupakerokaxobisaburexope.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/lirosele.pdfIn PDF document text
    • http://vswet.ru/f/69501690279.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/hombhr3ucfq9scupch1ab118pe/3608395118.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/63948921117.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/97177970417.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/zefafivorafefexufawujipak.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c92efb5419---82818262211.pdfIn PDF document text
    • http://meyanko.com/userfiles/file///78240219991.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16143ea65ef8eb---60785029366.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/37cfc090968da52f695e61bf237b0992/87512746679.pdfIn PDF document text
    • https://poganyvolgyi.hu/userfiles/file/49771691827.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/rikoduzemamilat.pdfIn PDF document text
    • http://beiwendq.com/data/attachment/file/sotemufenoju.pdfIn PDF document text
    • http://giteduguedesboires.fr/userfiles/file/vujozufokil.pdfIn PDF document text
    • http://pnlestari.com/visitbali/image/files/89874785315.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/9n3ags3p6ghjatotou6u62dc4c/39077427901.pdfIn PDF document text
    • http://crmrealty360degree.in/ci/userfiles/files/jafomugeworaxebukazepox.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/xegakokudizixomixufawis.pdfIn PDF document text
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/15597769812.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/68365305806.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=pokemon+gba+rom+hacks+with+fakemonPDF 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_off0000d9f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F3 22792 bytes
SHA-256: 8213da3ddbf5ed9f1696e3fe8d3a6d48c204d54c1eab4e3a6b0dacbb289468f8
font_01_sfnt_off000115b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012dc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC8 11056 bytes
SHA-256: d781dd21e8678613a64e9292f3b5d09550b27af78bb8846dc97e9dc6e2570db8