Malicious PDF — malware analysis report

Static analysis result for SHA-256 025116237c6b364e…

MALICIOUS

PDF

93.4 KB Created: 2021-08-02 17:06:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 328c26be836e54c43a9757cb5cd1510b SHA-1: c1c74fcbe2c8820a9b590f8879614ba93007f23a SHA-256: 025116237c6b364ecc97292165b131b9d83a3ee6db29187c09d5b48653f7b202
164 Risk Score

Malware Insights

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

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 pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of a 'download' button lure further supports this, although no specific script was extracted to detail the payload delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 https://coretry.ru/uplcv?utm_term=acog+2019+vbac+guidelines PDF link annotation
    • http://theemasternetworker.com/ckfinder/userfiles/files/tozeroliteworibafugemobob.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/53520943994.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/tisum.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/48327295902.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/95913191149.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/28268949459.pdfIn PDF document text
    • http://sun-eko.eu/files/file/94283280347.pdfIn PDF document text
    • http://jp-cable.com/d/files/rifubek.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/rudipenijejowerunepa.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/c84d253aaefeecf3dd5757c1ff037cf6/88867563594.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/28f1b232fe2dc06fca818f40c0d7ab64/lenipewemokuruvego.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783f96b3ef6---35423592715.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ff796205b3f---sogizojof.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/85670393251.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/54579885888.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/duxusetowuxi.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714283b2832---guzupokubonugemezagerape.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/1a16ce7bf6353316b5eda8aab7704487/42414279764.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/fe6af54651f10d7571276f01d3f60e27/58784003556.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a97b9a247---67483008089.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/basekawixefiboruxufepen.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/85911323398.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/1qi7im8bfj2pqdnp3b2tdssje4/55526468706.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/92959813454.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/4dltepf61g4ai9fcp8uqeva6n5/6101840027.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_off000106c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C5 11096 bytes
SHA-256: 287762838ad0c1d6832dee6b179f82985abe92a2af3ea0b56b444efff18b6bab
font_01_sfnt_off000120ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138BF 17500 bytes
SHA-256: bb045c2232786e2a1d3c2dcfaca0a1c81dfebf725ad075010a68e0a4408fd535

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