Malicious PDF — malware analysis report

Static analysis result for SHA-256 52a77498281d418f…

MALICIOUS

PDF

98.3 KB Created: 2021-07-14 10:38:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d5b4c6fd2806fc415ddb99f56902313b SHA-1: 43ea81bfa51d71d55a0bdc1097496450939ed333 SHA-256: 52a77498281d418f563614748afefa09adc9a92795bb54b9e9ed0035e73e17c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that form a link farm, redirecting to compromised WordPress sites and other domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URI heuristics and link farm indicators points to a phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 6

  • 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.
  • 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://catamma.ru/uplcv?utm_term=ibis+paint+download+for+pc PDF link annotation
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a50e75c63---71153459255.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/bguhrmji865n67q68mm8srgaee/90982086953.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160a5defb7701d---89204330265.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/90985073943.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/dtrplp0svk3saug7ltdmndnm3k/33845490491.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f061d95512---90875234634.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/juvezexeramoge.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/4unsq4132rna3jgrlb7f6dn42s/90036718223.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/304062428.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/2236eff83ea2f75d5b197d0692d51186/zimanudiwat.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/6e94e1795f7fd88bc8fb47bb264b581b/92025522069.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090725de7279---2571895433.pdfIn PDF document text
    • https://anakmeong.com/contents//files/fawamuvakojokumozogu.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160cabe57a21d9---zogilazopago.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/b4cbfebee67af34f439c0eb8ee23b9e4/8697422713.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e46010d5e2f---wosewe.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/13194539271.pdfIn PDF document text
    • http://inglewoodreunion.com/clients/68690/File/pobapozaxukis.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/vinenasenogevaxepukoro.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef7ea611dc---28895953442.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/ca2187504d49c46d4baf00768eb63807/4527012390.pdfIn PDF document text
    • 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_off00010818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10818 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516
font_01_sfnt_off00011d98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D98 10656 bytes
SHA-256: 20eaf46cca25a22fa83894c5dda604a42dba95d8b669ea2f0d6334e440e52866
font_02_sfnt_off000135f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135F8 17364 bytes
SHA-256: f7f497985a38edb5cc4c1f5b9827e8aa3128b59c02774ef121d5033defc4b76c
font_03_sfnt_off0001638d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1638D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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