Malicious PDF — malware analysis report

Static analysis result for SHA-256 70e539479c0e4604…

MALICIOUS

PDF

120.9 KB Created: 2021-07-30 22:34:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b846544bd31ace82597e7c4c8142909d SHA-1: 9ea14c21b5c148fe5ff573e6408c242bda1889e6 SHA-256: 70e539479c0e460427e4de0ba23d597f6ecdc208ebc85f44d1e6c5f54b273546
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://medvor.ru/uplcv?utm_term=problemas+de+lenguaje+algebraico+en+la+vida+cotidiana PDF link annotation
    • http://hvpeds.com/upload/contents/file/37199001721.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/neweruwewulesesa.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/sunakagamejet.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/tubufafotedoze.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/91734764506.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8711abf616---29025126571.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/fafibole.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8157e54ebc---xusavopewarijag.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents//files/gelulefoxirivun.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/bf9e2579974829810ddac5467008f59e/zavatezuvas.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/bexuko.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/78ccc22cc0e4707a680ff63d1852227a/51149460521.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607877a9f3f2c---zepase.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/60e85729c74cfff0f900211a267d98ec/24223283866.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a336489b3b7---80061601832.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2729ccff6a---34355018510.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/1a5ff786804895d84c3e71e0c5f0f96f/35189981377.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7935352fa---95178644134.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b792b3405a---1779385342.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/lojawewefutagiguxot.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/2mt4ihqb9ts5qdmmhdf9vitpkb/bigopa.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/f9a461c7940b2fac8f9b3ba3cbde5aa7/xugirogekasagugigaze.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f8626e2e5---45542249114.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/92256325582.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016efb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EFB 19996 bytes
SHA-256: 413b1b1a412c0faab09e5dd086ee1120a564c9cf5ab750e33d1b8a2db85cd28a
font_01_sfnt_off0001a1c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A1C6 11152 bytes
SHA-256: f36f6ad8c3fb92b533eeb5f53f2f71bfd0a19a8e21daae2bc727580dffd723b2
font_02_sfnt_off0001bb93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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