Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c6429e2e639c1cc…

MALICIOUS

PDF

93.4 KB Created: 2021-09-02 18:15:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e0c603d8ebbe7f19241cbfeb1c05921c SHA-1: c20abcabe445e5aec2151620530f71e06a1934d9 SHA-256: 3c6429e2e639c1cc3e558b819d317291d086e01a782c96ba04e305872abb0987
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dffe8b69a5b---13664147722.pdf In PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/45321828294.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/46134106066.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089c1e93d320---dusokujug.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/maduk.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/33205592086.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160cb4bac64d09---pevaguvunidoletopifaforum.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/42a89d401253924f9736405c59f241f6/malin.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091dfd8b9a5b---60495354283.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/02f8eaf438091a6a414956fc9588ccd0/bevazebeba.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/30912342312.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/d5c0ce96ac0bcc5ba82a511d61311980/texudexonesebuvev.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/6f6f498a8cffef521554a0f49e6f33cd/65559132712.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a01a95403f5---3682185835.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/78669839619.pdfIn PDF document text
    • http://xsteelstock.com/d/files/53549943229.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/2648837e457d195277397cc322024d55/56982696813.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105197335297---36870606284.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/rudevodigupujaxegazuxotez.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/70c31345cbce21ef2b9c736c65442f3c/29530174535.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/saneluvifedibisovuvi.pdfIn PDF document text
    • http://okwecare.com/usr/userfiles/files/944774650.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1611938fdb6c08---67246418848.pdfIn PDF document text
    • https://aitalk.vn/upload/files/faxexus.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/17746436508.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=predicting+products+of+reactions+worksheetPDF 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_off000102c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C3 11132 bytes
SHA-256: 8f1e730f74887413c5ca3cfd22918e0a2b5b39a4d6a9f55f52c34ea8533f0ffa
font_01_sfnt_off00011c95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C95 19496 bytes
SHA-256: a1d75429ebd1093b051e322932e2ddf5e39de6155cefd64ce7f2eebbc9465cd2
font_02_sfnt_off00014ff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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