Malicious PDF — malware analysis report

Static analysis result for SHA-256 13a8a095a4fbc582…

MALICIOUS

PDF

88.5 KB Created: 2021-07-30 09:26:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 04c761385d4bdf17edc282ec938ed230 SHA-1: 6a6b526b7c10cc00bbc1519c4b07a1835c284d57 SHA-256: 13a8a095a4fbc5820d470ad5d2c91a79f89e4f348b51d4e2d385e6421b8486d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan threat. The document contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://fanaf.com/article_ressources/file/segubi.pdf In PDF document text
    • http://littlepearlbooks.in/data/eimages/file/94814288348.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca3075857d6---26566106429.pdfIn PDF document text
    • https://vinaconexmec.vn/uploads/news_file/78846912957.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084440c91458---seradavasorovuwomexapaf.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/fvuc9jvn4p4lgvv7p4jna0u905/xubibovep.pdfIn PDF document text
    • https://qualitymattressfactory.com/admin/userfiles/file/86070796164.pdfIn PDF document text
    • https://bfull.ru/uploads/files/91165288941.pdfIn PDF document text
    • http://hintzfamilyreunion.com/clients/1/12/12a2788c5de59b93c87e4eff35998d4f/File/befumasoz.pdfIn PDF document text
    • https://procogs.com/FCKeditor/file/90872659156.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/15830290158.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/muluruxarot.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/31935836712.pdfIn PDF document text
    • http://dorapeyzaj.com/userfiles/file/balezevenuduk.pdfIn PDF document text
    • https://nilsagame.com/calisma2/files/uploads/vijufezanamogazenu.pdfIn PDF document text
    • https://aneri12.eu/res/file/44220568919.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/29bd6fa23461fc177c9c299eedcbfa4a/fuzukebavatuvanewox.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/fejeviwokerikosusotanage.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf5f7982ec---sowabaregufemexe.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba3494aaf7---11541383998.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/d4b138a6f877e511a7c55367f7aef5b8/zuwujezi.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef6f74407e---boxuwononajawekovu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+get+percent+yield+chemistryPDF 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_off0000f5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EE 17180 bytes
SHA-256: 3e237bbeba1b8fd6017147b75f65ee5acc1d215249716e3399b489a86aad9321
font_01_sfnt_off0001231a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1231A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B31 10988 bytes
SHA-256: 84479ba9c0033368fd649b3bd0735055c510ac72c7f96b1cce427de03e6962aa

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