Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3faf919507897f6…

MALICIOUS

PDF

89.4 KB Created: 2021-09-05 21:52:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 50da22f96fa14ad7b7cb8713889a03d8 SHA-1: f0a8bbe76541c74a92be1d87ff34850babfaa831 SHA-256: a3faf919507897f6e485f33cf77e490b8850ec16eddabf0deb280cc6b80228ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a tactic to distribute further malicious content or phish users. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, lacking clear user-facing text but containing embedded URLs that likely serve as lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/9opm84ernto6t12tdb9bu6hbvs/41493550682.pdf In PDF document text
    • https://wecareprogram.org/images/file/20617089668.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/zozikofades.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/2d5217e52d73f1272abcab0fa0dcaca0/46871444439.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/xuwilebatufe.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/27d9c66f3dc44da4434598b1094313cc/merabagoguvitogevano.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/57932701875.pdfIn PDF document text
    • https://lmcmanager.com/ckfinder/userfiles/files/fulijidituloxeripuwotiva.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/pubotajizumerilufuraf.pdfIn PDF document text
    • http://tsraccountants.nl/mailing/images/photo/file/15315733070.pdfIn PDF document text
    • http://ypdtools.com/ckfinder/images_store/files/rurudusaj.pdfIn PDF document text
    • https://newdesert.pl/userfiles/file/31889288385.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094476f7802c---61636816074.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/14b2d022a4c7a465a4bd3725622b4716/kamini.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/berebupenilozekupitetago.pdfIn PDF document text
    • http://exoticland.bg/upload/files/files/vezosabe.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/ff460efd2a4c53cbb8a94ae5f3acba79/lefodatezikujopenip.pdfIn PDF document text
    • http://svenskafik.se/uploads/fckeditor/file/papeposumafezoz.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/fovvouo0o5jo5v1huvbhkh25ts/9618057780.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d46c2c774---52285689513.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae02052eb1b---57764504909.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125d0b72e5ac---47021193640.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/d137eb3f8c885fa29678b61868b5cc01/rizaredufapegodobutiwot.pdfIn PDF document text
    • http://zonwering-belgie.eu/ckfinder/userfiles/files/gesudo.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/6983080813bf1299602c2f604ce46ca9/75582685680.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9438891af---95610753279.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+write+cv+for+student+pdfPDF 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_off0000f630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF630 10648 bytes
SHA-256: 1a3a4291f1342ce19992dfe6172fb814b75eb885701e8ea1eb32a9f859211991
font_01_sfnt_off00010eb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB9 18640 bytes
SHA-256: 465f95b1bf6b270fffbeb2a6ec5b9bae7eeec55f5e929f90497690582e67ba48
font_02_sfnt_off00013f65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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