Malicious PDF — malware analysis report

Static analysis result for SHA-256 1065e45ea6a02aca…

MALICIOUS

PDF

86.5 KB Created: 2021-09-16 06:02:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a2e67c17aa5dd4b083cf270c664ca4c3 SHA-1: c01f3fadfadb518b109f184a9f2154b9d937dac1 SHA-256: 1065e45ea6a02acabda2b2824fa2fa33912dad603d488986b3f81f54409bc091
156 Risk Score

Malware Insights

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

This 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, with multiple URLs pointing to potentially compromised websites or disposable hosting. The presence of external URIs and link farms suggests the document is designed to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://archism.ru/uplcv?utm_term=resso+pro+apk PDF link annotation
    • http://thedewakohchang.com/image/upload/File/2540171130.pdfIn PDF document text
    • http://tw-echen.com/uploads/files/202109100603377733.pdfIn PDF document text
    • https://foundationkuzmanov.com/files/guwimiwasotip.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210905_D0A4923809625F9E.pdfIn PDF document text
    • http://mebco.ru/images/file/7969678259.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/zezuresexeki.pdfIn PDF document text
    • http://nhagiatxanh.com/public/default/ckeditor/files/xanuvatebonijutizewupig.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db6a2407d5---42023349945.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/737453554.pdfIn PDF document text
    • http://fundacjahfg.pl/upload/file/99538886727.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/jebebopowejufexiwen.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/53120740291.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/4661187107.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/75364979492.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9794436470.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/82a3397935abad77c18cf668195f193e/tisimutitonujepol.pdfIn PDF document text
    • http://c-amc.com/upload/files/wepasafadula.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/zimefow.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/69913508322.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f113ca66a---mitikexidugexo.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16138bc0fc8152---22924039124.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/vuvitusataku.pdfIn PDF document text
    • http://odumakus.com/uploads/files/vulezarugapem.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/74549939426.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_off0000f161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF161 17356 bytes
SHA-256: 28ca36b443160b670c289abc5a9ae530f3eb1835339dc10325a7b926dd5cab7e
font_01_sfnt_off00011e49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13660 10044 bytes
SHA-256: 537bf58994830809245b7f1dc1c63f4ed0b779a3263129a3cc96cf4b801cd62e

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