Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c37dca706795aff…

MALICIOUS

PDF

111.7 KB Created: 2021-08-14 20:01:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 152368d79eb4448d3d4867f95bdb9a50 SHA-1: d54054f9490beffd052b0b2d5b2a231917a7b4a5 SHA-256: 8c37dca706795aff76644b87f9f91e3cbc6d07b464bf6745306259b475389f59
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9842

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://too.kg/wp-content/plugins/super-forms/uploads/php/files/37b77c9ebb0803c15e0551756413abf4/21609515001.pdf In PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/6dd13fc226f50a823ccad94f3081493b/80460036245.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/13e50dd02667cd60e41b440f3007aeb9/28719659927.pdfIn PDF document text
    • http://www.netcorp.hu/data/editorfile/motaliwa.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/vojufulusavuxago.pdfIn PDF document text
    • https://mandarinusa.com/userfiles/file/1626542809.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/e68dbc179af4a1db1a85a6cbfd68ac15/nafoku.pdfIn PDF document text
    • http://goreskyreunion.com/clients/b/ba/ba087d28c24afe6c5bc45fa062332e47/File/rawezaneme.pdfIn PDF document text
    • http://zerosquareonline.com/file/zekigarozarulapasoxemad.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/smuffbqf8flo5ctb448h1m8ioa/vapaxizisubam.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/636124b117f770708c5838a47fee4f47/74974958299.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/22375804728.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16098355a11a2f---wixapoxinojafid.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/aa3d726201b3478d99d9cb09339afa99/doxirepumetit.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/57584723993.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c7a8ea4ea---pivinimot.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e6db184e3abbd61209834b98c3cfa4b8/7828059252.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd6397b299---71385986095.pdfIn PDF document text
    • https://truonggiangcompany.com/userfiles/file/romorabopufigegepatoba.pdfIn PDF document text
    • http://cke.hk/userfiles/76021798445.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/visizetizamowetizegape.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/5fea48b0681f6fa231655b9ba21005a3/63825666794.pdfIn PDF document text
    • http://brukbet.com/user_images/file/wazezinefomivo.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/fa7f869d53680b8ded25f4eeedf2da47/41307243402.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ee4525d0403---bagevi.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c1bab5300---bugewezufut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=military+college+jhelum+prospectus+2019PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013b82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B82 11516 bytes
SHA-256: a4e9683040bd652b15ab1237eddf739c29f829d2af9d7981a1ebaf56ca0d679f
font_01_sfnt_off000156e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156E1 18212 bytes
SHA-256: 80d74d7e69bfaeee4d58b4c99ab15a89d82cce32f6de2fe392dd8c25ce27e229
font_02_sfnt_off000186b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x186B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00019ec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19EC0 4192 bytes
SHA-256: a6a444eec8d554762a485cbc40d013555d0675e384c0788b6a5e9c3973b10d14

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