Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bb3337ce44f72eb…

MALICIOUS

PDF

69.6 KB Created: 2021-06-19 15:59:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10e3a4f59f199c66b096c94ba86a26e3 SHA-1: e1836c83467e7226c04b94800e2c2384f3fe700c SHA-256: 3bb3337ce44f72eb608005d44e7c4b8eadf3c818eb4e4f14f12fdf5ef3403689
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many hosted on compromised WordPress sites or disposable domains, designed to redirect users to potentially harmful content. The presence of external URIs and link farms suggests an attempt to direct users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 http://insidethedigitaltrend.biz/userfiles/file/fawavimivezeka.pdf
    • http://capesociety.ca/uploads/files/86759980685.pdf
    • http://inezorviskids.com/clients/37546/File/31931258609.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bc015ab8702---kunajamixoside.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/teakfl9uk2d24lp80bflb5o5hi/30513106214.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/3b6da4beb9682d62e7d189d9531f7a1c/javudobodef.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082bbb3be32b---pilapipobezaze.pdf
    • http://albino-pitti.com/pub_img/file/8240322976.pdf
    • https://harom.ro/files/file/kagirogemapi.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc18e9d2a4---gitiraxerulewapakof.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/d8cbed32fbd0074f45dd64e470ff7547/41631657823.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877ae7b7afc---goronuxelorebav.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/4fdf99b9f2c24f102a4f28d5bb58f1d5/xamubijazugogurogev.pdf
    • https://laplacedesstores.com/upload/file/83774409102.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=story+saver+in+instagram
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d24d.bin
459a086498b339ad42e073644868947c0c384085c27e70dcee019c7a3e0433d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD24D 5236 bytes
font_01_sfnt_off0000e414.bin
a836c5cae5ce0f0a4b54af3971f695b36375c846e4a4954b3326b17dbfa90998		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE414 11220 bytes

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