Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b87f98309d91c8d…

MALICIOUS

PDF

84.4 KB Created: 2021-09-13 00:57:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6e1ac851117314813c7ad371e6ce5d29 SHA-1: 1e7c778412fa66972b69f849afc2df0f04b3c20d SHA-256: 0b87f98309d91c8d321d65b979b4cc3478ecd4c3519989b411fecbfa82fb6aa8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it functions as a link farm and a callback phishing lure, directing users to various compromised or disposable domains. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest an attempt to redirect users to malicious sites or initiate fraudulent phone calls.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://patrick-vallot.com/upload/files/zofadogoluwexukadaji.pdf In PDF document text
    • http://casier-a-bouteilles.fr/file/fobenifexades.pdfIn PDF document text
    • http://chieucoingason.vn/files/zadimoborevuwovonimagoke.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/fusizore.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/pemurososifevokekirawode.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb7e5a7ab5.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/22429312814.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/47310916951.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/darevivexu.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16136cc80f1fc0---56838453159.pdfIn PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/44422556749.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/21519122057.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16132136db228b---32378551217.pdfIn PDF document text
    • http://www.globalnautique.nl/upload/files/gulidesatoxolidifulunov.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210908_F1884B9EAB729B75.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/5ef99976f4b7c3f40f972f908f324eb3/bivizug.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/93436732490.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/32088191300.pdfIn PDF document text
    • https://soswzgierz.pl/web/uploads/files/nubemeg.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/38806319456.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/161357cc93019f---70069245468.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/37367988948.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=world+fastest+phone+processorPDF 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_off0000e586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE586 17784 bytes
SHA-256: b584c843dd59c669e3030fb39af8eba877c959ea2dcc2e3f67f2a8092de65e03
font_01_sfnt_off00011375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11375 10620 bytes
SHA-256: 086f2904c407539828be2f1247d99b9e3aa037334cb1a72040e3896a20e3102a
font_02_sfnt_off00012bb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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