Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a3dfc9a1d3f5753…

MALICIOUS

PDF

112.3 KB Created: 2021-07-23 11:15:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e6f2f73f4a9d6edd36c0c8a8bd4a3cf3 SHA-1: 0163683ddbd13ba085cb671451e8eb0c9998a077 SHA-256: 9a3dfc9a1d3f57532243775bf14f5ca176654010fb3ff111caf5d8616758a8f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF itself does not contain readable content, but the heuristics and URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9894

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 http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7b7b37fb8c967a3c9bbaa95a1dac783a/neturukerenumororomu.pdf
    • https://ideylia.fr/uploads/file/gegufedomovopetisexukaxa.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607d13f4ef606---negof.pdf
    • http://oishisushigd.com/uploads/files/winagetevelisuwewatelone.pdf
    • http://aylincinarli.com/fckfiles/file/77264518182.pdf
    • http://pinzimoniofiumicino.eu/userfiles/files/dutexusuxugiketix.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/7o4i4nfmoopvck27f24hhh6cmh/85046073575.pdf
    • http://maychamsocda.vn/images/userfiles/file/33274595373.pdf
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/daa6d988e9f52fd09985e9ea1709317b/72207418056.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/972b873cfbe4aa5c596cc39916913739/75077131923.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160754d0d2b031---24613761976.pdf
    • https://cosplay-expo.it/ckfinder/userfiles/files/nizalujefareviliwa.pdf
    • http://unipsyclinic.com/userfiles/file/20210522075732.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736b4029e09---84664800492.pdf
    • http://usarsenal.it/userfiles/files/fogox.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c75f49658---57208329169.pdf
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/4529035d37391e1816e4ef16348232f2/lupatixe.pdf
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/0f3bec128f5cfe815aa8456958fde894/zulupuxasedidijupe.pdf
    • https://ratsimae.eemedia/contents/file/37269333158.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072863ed80ed---72094883902.pdf
    • http://thaide.org/userfiles/file/bewilogifo.pdf
    • https://makenie.com/upload/files/94454231559.pdf
    • https://creativitagh.com/pevron/www/img/file/zobukigebugof.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=the+meaning+of+gimmick
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001062b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1062B 16792 bytes
font_01_sfnt_off00011e42.bin
2006417a31bdf25dfb2cc130f6e3c2e684f3a862392b007f8e0506a4b3e332a9
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E42 10428 bytes
font_02_sfnt_off000135ab.bin
a9609c0ab8589ed72712a5cd378c2275e7a95e24691c9b81a9c5c673d889541d
pdf-font-stream PDF embedded font (sfnt) at offset 0x135AB 26492 bytes
font_03_sfnt_off0001758a.bin
41186b18d2444483a43c278efc9cb4af03b528f1def7c582dd510136e2040545
pdf-font-stream PDF embedded font (sfnt) at offset 0x1758A 22736 bytes
font_04_sfnt_off00019ecf.bin
d791d3b0bb08ac5c05532a0ef1a54541bb39d1c45175b49a9a0c1ed775af8775
pdf-font-stream PDF embedded font (sfnt) at offset 0x19ECF 4784 bytes