Malicious PDF — malware analysis report

Static analysis result for SHA-256 86f32392821ce823…

MALICIOUS

PDF

97.1 KB Created: 2021-07-05 02:29:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 840a6eee83822a468d7e28606857fad5 SHA-1: 4e16e000d86a9402f8d53e5261319f187da3bf9f SHA-256: 86f32392821ce8236e6daef7de20ab7ade0b56dfb147c12eed64f7f7759a475c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 WordPress uploads and disposable hosting, suggesting an attempt to distribute malicious content or manipulate search engine results. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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 https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607718c86ead2---72106008456.pdf In PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/07fc33ba5fb38b58b310b81cb87d702a/mopuru.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/bamipubukozuwopere.pdfIn PDF document text
    • https://t2sc.me/userfiles/57252203696.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e018c733df---31385746073.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/92292472209.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/56462459109.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/91533078009.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/takudelubob.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a6323dd9d73---66332420878.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/telodiwedud.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/ffag3970oeg3521ueu17ebqcmc/66031631280.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160918ada17de3---xenalonokumeduvikano.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609888e3b880e---nokumenagap.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff4dbd7dcb---61306478899.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/c25767396c0c67190029667adb61e79d/wefevej.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/1663a5ef314909acb0b777a3327f8ff9/rosupogaleboko.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/961cd9c4fe2202bbd83ad3c825264748/vegorajefowonakavumufij.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771c114b178---xokaviladelagukog.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/ad14759ebe5a3e584b16d3a67c90aca7/lawepedap.pdfIn PDF document text
    • http://sgpeo.pl/users//file/11763795302.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608eef04dc9bf---64802752575.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/065d41ebaa12af54fdf6aeb0706090cf/tazajarejidimim.pdfIn PDF document text
    • http://dallassymphonyleague.com/clients/1/14/14bb4a025281f1a32078cb68571f7cf3/File/8922360979.pdfIn PDF document text
    • http://beachhigh65.com/clients/879402/File/35937199544.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/6434794704.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=i+tell+you+once+i+told+you+twicePDF 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_off000119db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DB 10184 bytes
SHA-256: ef82643be3dea506aeb2d9667befe5b0d340c125b6c90d1d769ed46f6a66b34b
font_01_sfnt_off000130cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130CB 18028 bytes
SHA-256: 5990b25349931f479cc04d28056d0906079889d80c359c3f1dcda952a382cdca
font_02_sfnt_off00015ed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15ED8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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