Malicious PDF — malware analysis report

Static analysis result for SHA-256 8393582496a15903…

MALICIOUS

PDF

93.5 KB Created: 2021-09-05 05:54:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1c9888d08f05c5237474cbf64d855a37 SHA-1: ff50eed8462c3eede0fc8ba073951308d072502d SHA-256: 8393582496a15903cb9584c92f4043f7d8789414fd17ae2b6858de0fff11b0d9
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is flagged as malicious by ML classifiers and ClamAV, indicating a phishing or scam attempt. The document contains numerous external URIs, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users. The 'SE_CALLBACK_LURE' heuristic indicates the document likely prompts the user to call a phone number, a common tactic in tech-support scams or phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 https://queure.ru/uplcv?utm_term=lacerte+training+manual PDF link annotation
    • https://sahyadrisevasanstha.in/userfiles/file/fusasusotelapetuxa.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c8d8f0b6d---83938728585.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/19178803132.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/giov119thvojm81bfdqb047ra0/kobesulevejasekexaborube.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/majemidizutelirez.pdfIn PDF document text
    • https://brickbodysupplements.com/newerac2c/userfiles/file/bafodimuzupiwiredewavije.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/a640abe108d57b537b0247378cbee0c4/xovufarivupiwa.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/55545375759.pdfPDF link annotation
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2cc2d95b5---17519960107.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/44920246139.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/85472562074.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/61029711679.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d841a7de2---63045714775.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/186cae5d5bb84f68a32072345a778c60/jexoxasiminifamel.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161048b547a167---sajazuviwaletuwuvix.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210809_759DD8CFCEDA41A9.pdfIn PDF document text
    • http://sshs61.com/clients/6/60/60e739d5a8cf4a6710e4f064fd99417d/File/votibakibagewelugabop.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9cf475278---webapokesezikevakesu.pdfIn PDF document text
    • https://rotitelor.com/contents//files/gebewalaperulozisekutag.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a391f44906c---98554256561.pdfIn PDF document text
    • 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_off00010522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10522 19828 bytes
SHA-256: bdc79142aa6bd269cdb4593d5dceef5b8b523510c1ccdd3809f714c9dae9fd7d
font_01_sfnt_off0001394f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1394F 10344 bytes
SHA-256: 88c4a02b307589d74b5d43d62e8fba761db3cc96f73b62cf783728d072bc5a3f
font_02_sfnt_off00015097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15097 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1