Malicious PDF — malware analysis report

Static analysis result for SHA-256 2eb65f1d9b790228…

MALICIOUS

PDF

89.9 KB Created: 2021-07-01 13:09:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b61abcfb6d6bcd4d541aa39ae58f1947 SHA-1: 9828d6e07449477c4daad61ebab605e347210640 SHA-256: 2eb65f1d9b7902281f1ad04241651e271cac899c9f1e0538d023447bd0733ab2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links pointing to compromised WordPress sites, suggesting it is part of a phishing campaign or a distribution point for further malware. The use of compromised CMS upload storage indicates an attempt to disguise the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608052557855f---96571285331.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d9f6e5cc6---31852385584.pdf
    • http://diamond6ranch.com/userfiles/file/78364180561.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/91cbedf43377400ca7073e396d884c24/11248690446.pdf
    • https://rsun.pro/admin/ckfinder/userfiles/files/bodowumibigotedasa.pdf
    • http://tamker.hu/userfiles/file/mimaxosidatevopoditup.pdf
    • https://victorybear-info.com/userfiles/files/foguviwuge.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/af6143bace8a6dec49b6046650f76801/93561518547.pdf
    • https://mmagame.com/userfiles/file/62284954193.pdf
    • https://delphin-restaurant.com/ckfinder/upload/files/64448815672.pdf
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160840dd346ae3---dulenupunokarixelugo.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/247a3e06091998a765cce62b75a5ca84/farinisomubelewarogesideg.pdf
    • http://olversonfamilyreunion.org/clients/5/51/51a48c89da211807e19ed56f8a1a1822/File/purabuna.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608180c26363d---saronazazewipapotoja.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16087a5bcefdae---93167767435.pdf
    • https://noihoithanhtuan.com/media/ftp/file/80793587986.pdf
    • http://hgbs.de/userfiles/file/wugobepasiginut.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/514373a83e2f0d4ec78116964a1afd13/leribiludotepovi.pdf
    • https://astek-telem.fr/userfiles/file/nizelezenevugi.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be1a6d1df4---fufuj.pdf
    • http://animalscipublisher.com/files/upfiles/file/jiwazomapajujomerokolewe.pdf
    • http://aquamedia.cn/ckfinder/userfiles/files/kavixenekawezideruniz.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075de45028f1---24935644700.pdf
    • http://atenngo.com/admin/sites/site/documents/1181527114.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1aa26d9e3f---50169230811.pdf
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/653a4776253b87ce2fbb90939a6d4390/89167452413.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072380d4ae1a---94575522026.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=in+memory+of+her+fiorenza
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010039.bin
b1cbef8e226e8be92cad6c42446d42d969467ceded9a75adbef44118aa07a743
pdf-font-stream PDF embedded font (sfnt) at offset 0x10039 16664 bytes
font_01_sfnt_off00012b65.bin
085b2ab79aa4269f39508c84493c5487b566673dfcfe74fd3ab5b6ce9445a75c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B65 10292 bytes
font_02_sfnt_off0001425a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1425A 16792 bytes