Malicious PDF — malware analysis report

Static analysis result for SHA-256 fffa707993ad8133…

MALICIOUS

PDF

99.4 KB Created: 2021-08-14 06:06:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8664943f8e2d57dc9f0fbe08aa324774 SHA-1: 421ca6c98ff1fb14f94c6d73433b9a337af841aa SHA-256: fffa707993ad81335ba433cef163857cd5908026b2d4be6d418e24ede7b80db4
176 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a callback phishing or tech-support scam, as indicated by the 'SE_CALLBACK_LURE' heuristic. It contains numerous links to potentially compromised websites, suggesting an attempt to host malicious content or redirect users. The ML classifier and ClamAV detection further support its malicious nature, likely exploiting PDF vulnerabilities to execute code or deliver a payload.

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://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16073cb5269cc3---pupufuwiwozedakafetuzutur.pdf In PDF document text
    • http://agnieszkapawlik.com/userfiles/file/robalipakizanuzedufofu.pdfIn PDF document text
    • http://aahsclassof1978.com/clients/b/b6/b6117739535924054831d33ecd54b00a/File/wobapinetulevofuzet.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/8b07b5515719466b57e00aaef1dd112d/47122808815.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/3k8ttkl5qsa8junvqtf9hb0nc0/fasogomamese.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/3905313602.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/21b389a03d0f9790a16261e01bc3a4f2/zorizuzuwupapejo.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/5b4827efc0a0c8f298019bbd13b545f8/37857340604.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/bc581f77d33bbe56ece3e2067dba9fc7/97434391130.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/5pg1v8ddnkve2omtfpnr9luen5/fotimumasojev.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3babe0c7a---27031429382.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/wobesesuzurojaxofazere.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/6d36a8754ce3871ff087da4e22390bef/70523712779.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/8cbfa8a3e536b4a8765f4dee34293852/7793517547.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/remabobatap.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/noperotogevoxadomiri.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/285a0adde8dcea8946564d4d5e76621d/55655838521.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/7d1ace18f4730f063076ebc1ff827dd1/13777539069.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/gefedegebujepawikut.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/321bfac7d530894300283729e1a6c003/xogojoda.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/75157729586.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/46781580258.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/0bk2k9mhh1ob5i8s4t4c47e3b8/nojosusu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=dallas+tx+chat+line+numbersPDF 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_off00012254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12254 10716 bytes
SHA-256: d2b76e491339379067cdb874fc1cee58f1fde47ba896c9c7e0066a7bca2feaf7
font_01_sfnt_off00013ac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AC5 16908 bytes
SHA-256: eb70212ea9bbc48ba9edf87e7ef727040a1e583e6e25e5158183bcfa872a0038
font_02_sfnt_off000166bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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