Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b3ee36f0c1ba643…

MALICIOUS

PDF

80.0 KB Created: 2021-09-18 10:33:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2cb58dcaaab0cd2c9b51afb087ae60d4 SHA-1: 1b5f4a56bff28165d3346dacbc4e8c8f4ce134da SHA-256: 0b3ee36f0c1ba6433553c2d8f4c7a8cc4d37463aab198e6144bb7b9b8b647259
164 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS upload storage or disposable hosting, suggesting a link farm designed to distribute malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://baigeleather.com/userfiles/file/53870267956.pdf In PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/zamiwimegox.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/volopabokogakofumaxusude.pdfIn PDF document text
    • http://oiseau-bleu-morzine.com/userfiles/file/degimetiwakoxem.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/44081483809.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161437c1d3804b---72684851728.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/dewojajugutazovefasuwa.pdfIn PDF document text
    • https://salonrewards.ca/images/file/10007366350.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/161400148e5a7c---93458607491.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/mebowitavebe.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/27640307853.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138cec6ee033---35939590848.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/70918572163.pdfIn PDF document text
    • https://griby.biz/ckfinder/userfiles/files/dokuzukiradevevamojora.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/34049588715.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/tamuwadapurimemopazumufif.pdfIn PDF document text
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/ritudufopubiradudesumaf.pdfIn PDF document text
    • http://erictex.com/ufiles/files/24214218464.pdfIn PDF document text
    • http://myredm.ru/uploads/file/6035339770.pdfIn PDF document text
    • http://sportsclinicwest.ie/media/contents/file/7254637991.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/8725947727.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/nuvinivopunererixozo.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/93963267577.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=mp4+video+songs+downloadPDF link annotation
    • 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_off0000d45a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45A 10592 bytes
SHA-256: 629fb6f89354973443edf4d15e1567a357532101ea0b42359a08d3e5ac8db1aa
font_01_sfnt_off0000ec82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC82 17840 bytes
SHA-256: ccf763e422a3bb90d495db582f8122a591fa875a64763b855b6b28fd242b9605
font_02_sfnt_off00011a58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1