Malicious PDF — malware analysis report

Static analysis result for SHA-256 1abb18d261cb0e2f…

MALICIOUS

PDF

81.1 KB Created: 2021-08-11 21:13:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d38d53b76e52f3bbce16d7f43ecd1b1d SHA-1: cb6364946ef48391774c57f37a295daee5a29db9 SHA-256: 1abb18d261cb0e2f3303a13cd9c4de35d56826832796ed410d0e6633033f5307
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 trojan. The document contains a link farm pointing to compromised WordPress upload storage, suggesting it's part of a larger phishing infrastructure. 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 callback phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c74e1c8285---56282187001.pdf In PDF document text
    • http://zulassung4you.de/bilder/file/kuvipogitimatexun.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1481b5838---varixapisozizo.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608c861cc22a8---80841634781.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/63884107831.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/digosupilinegodidimal.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/nar64dh47b3o59ioviabcb5h9r/jelakadenasegodat.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/tagesaxibit.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/konafetagerasitetuvo.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160dc93a11db51---kawonedolixaxafu.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/nikiravesemubasaredisaxa.pdfIn PDF document text
    • http://agrion.org/upload/fichier/barijovuwomix.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16094bfc81866c---2245411562.pdfIn PDF document text
    • http://rhodeislandalpha.com/clients/56223/File/bobidajifugid.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb3f5c143b---zemadaruzonomaluzod.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/473332a713e210f1589ad4d94a3eebbf/25254132060.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/natibotupixosipixul.pdfIn PDF document text
    • http://decorstore.eu/upload/file/gubobogodegar.pdfIn PDF document text
    • http://crm333.com/documentos/file/rejajuvoxijizizib.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/b3e233eaf87bf85b10e18f1c87877f02/kamezawefinofanut.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0f6c409b17---63617454957.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/32473164196.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/faleweki.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210714150649_1754575118.pdfIn PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/zujobotimu.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/tunenowezijupotaxamura.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=moto+x3m+pool+party+unblocked+66PDF 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_off0000d81c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF033 11296 bytes
SHA-256: 6daae1c9396e8e105330ddd65fb2c4a9f2edee010e2fca55469e3ea60dbb4055
font_02_sfnt_off00010a96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A96 16788 bytes
SHA-256: 8f5ccaddab59f85cf980ec07cd525435877ac0e7848ef70f3360c2a440ca3fff