Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae7ff33614307499…

MALICIOUS

PDF

88.5 KB Created: 2021-07-29 23:05:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: de1b4f66368d71db063039c40944d4fa SHA-1: 1850953b4340d446bbd112dda7323e0376558d4e SHA-256: ae7ff33614307499d6d536ac68ea5285d2ebf09f71e10b8a6ce3b8a6a31a6986
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content or for SEO abuse. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdd1f9705d---68941650892.pdf In PDF document text
    • https://dacinsara.ro/fckfiles/file/zajujufibenasufowafok.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a45768d16---10876471598.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/68813898811.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/d542ee70498e0dcce131e35a71763df7/78122209002.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/c71455a2068d19ac0be7d6ee3a0725d8/fasovogor.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a5346befd---88884500393.pdfIn PDF document text
    • https://mahae.hu/files/files/wugezaba.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/f7r3ilem63ch81d0a2n5as9ojj/datof.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/gonaxamuxe.pdfIn PDF document text
    • http://rowsontw.com/shopadmin/upload/files/setikozobekutikegusu.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/ralejifinonomasidi.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/d0a1b848b7daa92857935e909ca1418b/rixefavowuruzu.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/malorabugevusunikezijave.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/74ea9f52620b3146237d363266967aab/jametidiwukezunutexebap.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/xagadexixukawa.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-5/file/mewivekusekolasuxogubiku.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/044ea9b71814a79cfe286a4973c1fcee/35264123911.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2a9dd0b0b---fefatelapafuji.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16072ce52b84a8---lejigodudiragumasu.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/3ugv54gpf7df4spfuuqe70sttd/40479907687.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/8qp6tcuh6j6714ea4k7qcav2p1/mimugudojutiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+get+minecraft+pocket+edition+on+ipad+for+freePDF link annotation
    • https://mediaget.com/userfiles/files/pitofewusotifikexegafaxar.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_off0000f314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF314 10920 bytes
SHA-256: 0743fbac3fbdd082d4baf62e84a7d1c1f91b8a84d2f8e2ff8fc36a162b2339e5
font_01_sfnt_off00010c2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2A 17780 bytes
SHA-256: 38f3fac4102af8bcb9c6c7e1aa4b9251ab3ba6e9c28d9233a8183fc7feba90f5
font_02_sfnt_off00013b2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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