Malicious PDF — malware analysis report

Static analysis result for SHA-256 52ab6d7ec4ffb31c…

MALICIOUS

PDF

92.0 KB Created: 2021-07-05 19:01:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d3c69d197d0b12565bdf21e77aedc5c8 SHA-1: ed4f81cdefb869a7626dbd756b453ccc82df0647 SHA-256: 52ab6d7ec4ffb31ca7ed8cfd77283c411f01822e0fa44058159f8250052807f3
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 reveal it functions as a link farm, with many URLs pointing to compromised WordPress sites, likely serving as a distribution point for further malicious activity. The presence of embedded URLs and the nature of the link farm suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=list+of+colours+alphabetically PDF link annotation
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a75a82605---92891337222.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/14d95db15ea4525924fc268a9babedf8/figufodazu.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a65f8aba40c---75390722368.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/1372796aeb8a028aff23d71a4cac7765/boluxurobugego.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16075348d490d9---gojagidugifu.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/354062247b884c24893a93042f9c248f/gemivonuvusobasujifokajof.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607796d165671---jomawepafipiz.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857cee21593---jabafikozez.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/21340995028.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/29429af0a10f1d5bbbd33346371ec77c/pizojo.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/fuwenamorizufi.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160c1fc4b2a4fd---43184576876.pdfIn PDF document text
    • http://nfc.soo.jp/file/30330112687.pdfIn PDF document text
    • http://sam-global.info/files/file/budifogope.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ccb38f62bdc---mufowibetimimuxadawuwem.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/ll15kce7keiminoloog9joa91g/5326146720.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/1e729d3bf6265c8c1c3f36a9a1fe70ee/68219910573.pdfIn PDF document text
    • http://divorcefinance.nl/uploads//file/limazujalivanisupabuvis.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869b133d8ef---dodixu.pdfIn PDF document text
    • http://psychoterapia-przemysl.net/img/userfiles/file/53106709815.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d45a738919---zegirejub.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/34201738320.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/wiwajadezidigifogubureso.pdfIn PDF document text
    • https://waroproject.com/file/44644422772.pdfIn PDF document text
    • http://inlygiaylynhua.com/upload/files/tavidijizumemamoliwedujaj.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_off00010149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10149 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11960 10784 bytes
SHA-256: 075a85071c586044ade4caa13f0d131a144cfd79fb9a63d09ab7a3ed22700dd9
font_02_sfnt_off00013230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13230 18004 bytes
SHA-256: 9ec6ad98f992ba6f625e6a997f698329f45398c2bc827652388e68d27121d179

Open this report in the interactive analyzer, or submit your own file for analysis.