Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2b6e1850ebd6099…

MALICIOUS

PDF

70.2 KB Created: 2021-10-01 11:20:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 902eb0229d3389e2880014f2b62395af SHA-1: d59ea012472db91bbd8469f8dc1267af8a636e58 SHA-256: e2b6e1850ebd609980e30ed239b689a177d671f04e4ce7e66f23560880fc18c9
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. It contains numerous embedded URLs that point to various domains, many of which appear to be part of a link farm hosted on compromised WordPress sites or disposable hosting. The heuristic 'SE_CALLBACK_LURE' suggests a potential callback phishing or tech-support scam pattern, although the document body itself is heavily obfuscated and unreadable. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a strong intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://crewmak.ru/uplcv?utm_term=english+file+intermediate+third+edition+workbook+key+pdf PDF link annotation
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1614f29a96d1b0---dedezoxaligedurazanemulaj.pdfIn PDF document text
    • https://promoform.coreform.it/uploads/file/46019645752.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/nanomutumat.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/15187206209.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/2862245348.pdfIn PDF document text
    • http://ruizhishengwu.com/uploadfiles/file/090708012064.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/88519081737.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/84620008347.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/fonekojunobofe.pdfIn PDF document text
    • http://ablerexthailand.com/userfiles/files/sudilalavixokufukeji.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/ero9sf94vm3bamhv4qtpb3qtoc/57461931058.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/nekuvakaduzemetija.pdfIn PDF document text
    • https://shatalarab-llc.net/userfiles/files/wiridakofelufe.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/xasuvujaxunolupowime.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151bab789256---gazawazofurize.pdfIn PDF document text
    • http://birdwatching.sk/media/file/bewoxezafujovezotix.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/92435330156.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16133a9b74a082---worolomi.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142a3a19bb70---xaxati.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30965477739.pdfIn PDF document text
    • https://miet.hu/kepek/jebeb.pdfIn PDF document text
    • http://gyogytornasz.hu/editor_up/4582695772.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_off0000afcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFCF 16080 bytes
SHA-256: f313b92c961210cd327a2c213fdebdf6c9c53f08a3df969da0e92605f13a0495
font_01_sfnt_off0000d8db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F2 11360 bytes
SHA-256: b57f509c706251e5bba16bd92d67e4c8eec1fbcb184c50c15c39870ca0e08f4f

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