Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f5cfd0d319d45ba…

MALICIOUS

PDF

94.5 KB Created: 2021-06-27 04:37:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5c68eaa3dade4d3d05f082a1640d4430 SHA-1: 55fa6466de9af8dd15f0b5e846b8be8d95f51909 SHA-256: 1f5cfd0d319d45bacfe2958ae2acddf528b9f4ff9c01c15ce7b3c4e7f8c0dd01
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by ML classifiers and ClamAV as malicious. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users to potentially harmful content. The document body was unreadable, but the heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/7ui95e6uassdibb8i6r52cpp1s/14756319044.pdf In PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a4cd41e014e---59692076492.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6f3ddcffe---24775087634.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/9871bdba0fd3db93408bc9e37a08f15f/bizufezu.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/7144e32445a2cadf987ef0812cf12dcd/78318751447.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076abdfbc029---xobezuforamok.pdfIn PDF document text
    • https://murderescape.com/wp-content/plugins/super-forms/uploads/php/files/f746cafb440eaa08da7cfb9f73a5de37/65853931380.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/b873803a4cc98a77952f5ec4803f28dd/83705064604.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/utspp06bmdna326b3dhn76de51/zekavutigekepijulumufar.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a3019c46495---15489447598.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/63381179931.pdfIn PDF document text
    • http://bwc.lt/i/varopetemilapuzakijedujir.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/587934409.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/da6b2db030e1b8b6e13ae07e8d92220b/11887501642.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/431a5d3825b176208922a75c8e3f361d/nujanamonamuwanivipo.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/nudoxitukegozeko.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072814e13f7c---56956421986.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/95503651937.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/b108408b3a0c32676c4d95e7cf986aa5/94105102133.pdfIn PDF document text
    • http://texmet.pl/userimages/file/ragotopugekadisid.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/f42bda9d4a04660383aef673cbdc9912/sitetisunisavigeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=classifying+content+in+social+media+happens+through+an+activity+such+asPDF 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_off00010a50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12267 11380 bytes
SHA-256: dc498587a05ab91d500e75a2f276b3eb0861f36e2d5e457d441b780fd026f37e
font_02_sfnt_off00013cd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CD8 18076 bytes
SHA-256: cd3856957c978bed42d9586acf3752fb1c204fcd0e577ffd52a7f02916f896bc

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