Malicious PDF — malware analysis report

Static analysis result for SHA-256 a34c9ddb934549e9…

MALICIOUS

PDF

76.3 KB Created: 2021-09-06 11:51:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0f949e14639bc3763dd7e71e01bd169a SHA-1: dcfe8e8737749f1f9cfbd21ae940d662724116dd SHA-256: a34c9ddb934549e9d360b2b89b601e79001ac417364b65c1168de6c43b5062dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16109c732b22e1---gugev.pdf In PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098f5c99f6ea---42287319496.pdfIn PDF document text
    • http://home-delighted.com/user_img/files/tutiga.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f952d922fe---semipaduxim.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/57281922766.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f7f3a379d0b---33942951675.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/46963141548.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/dovesu.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/7b65000b13f3334468988e01b8d9fed2/74797902850.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/l3li0h3ltbsue1n9iv7dvebisr/41245652366.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/34736506640.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16081ccc19ab22---mavizajukazigexusidep.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/47cae3463890f4d218153c878a096ef6/8245597545.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/56701225153.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/9m8cpir2fhef8odume7pm6fj24/papisor.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/95345061820.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/ceab842cfcfd7957db4888394e615c48/80190888798.pdfIn PDF document text
    • http://megalaserasia.com/upload///6904031811.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/7189409240045d40ac838bf878122c43/6875830138.pdfIn PDF document text
    • https://ags-car.com/upload/files/35164835955.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/68c0cdf6a67b1656623c4aafa8217064/nuvimiluwasonumesemam.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/rudofabesafis.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/gejov.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/galafuvenedaxokagip.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16220208975208.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=tutorials+point+javascript+pdf+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_off0000c421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC421 17692 bytes
SHA-256: 269b1b568550a3728265426fc47d05072f3653b361a21a444854dfa23573664f
font_01_sfnt_off0000f1ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A03 10824 bytes
SHA-256: 71b7cc461e0decc42480687c51f660a8f70c0030f983486d1e80990a30fb3cb0