Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4bdba29444a36b3…

MALICIOUS

PDF

85.7 KB Created: 2021-09-01 23:20:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 858be415e0e6cba8fb87064cc6f8ea55 SHA-1: ebfaa1dd040ea3f9e26fb3184705e55751922458 SHA-256: f4bdba29444a36b39de2859da1c85b5da4041ff43c10d4e6a890c2e882786018
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it's designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues about its intent beyond the presence of embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://inwebjor.ru/uplcv?utm_term=complimentary+words+starting+with+n PDF link annotation
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/40961314587.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/binisetufumajuramuv.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/rifaj.pdfIn PDF document text
    • http://arslanemlak.come/file/12557463856.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/tikaxoxuzojero.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160852824459ad---ruderivasukuto.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/j0o46oe00djhmscs7smnso7vr0/robefedenolasapo.pdfIn PDF document text
    • http://piecco.eu/upload/files/79857034932.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/5644584094.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/0ee16a09038849612135ac9f92bdf422/39969975555.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/59827741810.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/8gdcp52fcl9aebevofpldt40h3/melurewif.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/noak9ikvhtmcspf3j7nqc26o36/jusiwujakesipodavafudusow.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/retefe.pdfIn PDF document text
    • https://harmony-lazienka.pl/Upload/file/xapejuwewasuramidofekup.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/016d8ba60b22f24c02ba8127d3ce2860/13081771412.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/ba255e9287942011bd0d4829cabc9c2b/bebemutolivaze.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/tokojujizag.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0313c9aeb---7058988202.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/98290608872.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/fdb43dc8d13c1676ce536d25f1343ae8/43067094791.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/wofuki.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc795db1a71---14137660605.pdfIn PDF document text
    • https://digireg.org/upload/63670785056.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/14048969532.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7428c0618b---93619943853.pdfIn PDF document text
    • 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_off0000eae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE4 17100 bytes
SHA-256: 452be5759a28483e282cfa7a36019cba87e9fc7d70f2d74506fd94d26605be1a
font_01_sfnt_off000116fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FC 11068 bytes
SHA-256: 28234affac734432ac889ea1efd80754d6bdeb8e8efe30f0f48d8db61513214e
font_02_sfnt_off0001306d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1306D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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