Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcf29f926506c5a1…

MALICIOUS

PDF

82.0 KB Created: 2021-09-04 08:04:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c897a523608dc52bf476f6b8d84b8875 SHA-1: 73143ff7c815c0382ca57d47e91bd3f3725c5237 SHA-256: fcf29f926506c5a152c3dbbff987cce5ca8e5bcc22968ef3bb805fd75fb48e20
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that exhibits characteristics of a callback phishing or tech-support scam. Heuristics indicate it contains a link farm and is flagged by ML classifiers and ClamAV as malicious. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to direct users to malicious content or engage them in a fraudulent conversation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.aadhar-interior.com/userfiles/file/zalululepapupetow.pdf In PDF document text
    • https://gcr.goldcrownresort.com/magazine_files/files/verewubewiwidoravemazuvux.pdfIn PDF document text
    • https://digireg.org/upload/84188088024.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16077356da0827---nifapixakiwavasexiwogikat.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/68729bccdecacd192d488ffa8e0df949/51789449176.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/5439441519.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/14rponc1jd3bhnin4u9jc4r2vm/kosuxolomunelakiw.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba169d5e110---tubas.pdfIn PDF document text
    • https://mgrenginiai.lt/ckfinder/userfiles/files/65570427321.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/daxotamosudufut.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/51635428349.pdfIn PDF document text
    • http://alde-pace.org/ckfinder/userfiles/files/57810401127.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dg4u1piofoq8bs80ud7f2fd660/busefulisazawigavir.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/pabewixijavejufugidokaxaj.pdfIn PDF document text
    • http://airsoft1.ro/files/file/ganazotumadedevuke.pdfIn PDF document text
    • http://ithaca1962.com/clients/41687/File/85681533987.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/672554595.pdfIn PDF document text
    • http://hoangminhphatkorea.com/webroot/img/files/66915671402.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/37d9c865398ada14e995697681c9385b/72154814025.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/nalomamireto.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/bdcfcb913e4bca22f7a083510f7ebaa0/7161630558.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/biridawomabasu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=signature+manuscrite+pdf+en+lignePDF 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_off0000d781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD781 18948 bytes
SHA-256: 3264694c13d38f54e1ee4d4381f3e927c28795f1108c5e9b591cd3f1b2921754
font_01_sfnt_off0001070d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070D 11020 bytes
SHA-256: 8de9cfc793a2d1a71a76235dd53d17f0430c05c6526eacf840b48b69f95e3829
font_02_sfnt_off00012074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12074 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1