Malicious PDF — malware analysis report

Static analysis result for SHA-256 d13d20d6f08c2aba…

MALICIOUS

PDF

90.9 KB Created: 2021-09-10 18:15:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3c8e39685a1b0d49613927b89021d4b2 SHA-1: 51be93d13d0f660eb631e6f01637bbc8965a0613 SHA-256: d13d20d6f08c2aba063a1cd92d0798a9328f5e3667164278a641266e147ed961
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, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://crewmak.ru/uplcv?utm_term=emulateur+nintendo+pour+android PDF link annotation
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/dee3cab0c30a39689297a7e440da9b26/biruviruzifipizilivikonis.pdfIn PDF document text
    • http://sooclose.eu/upload/File/wapuxilof.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613853d4c6821---13129192658.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/jemujalovanizomapeborisu.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/nonukozaxofowigamonozumag.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/13675209716.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/mipitigabesi.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/rolajadoroli.pdfIn PDF document text
    • https://kozmetikadunakeszi.hu/userfiles/file/89572619687.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/29030033110.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/3207594162.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/296ee2af8e3a02185480b68a7ebae0c7/24872180451.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/84012963274.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613af77d33f6a---jakuturedifivediza.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/c00a7770cf6b6645510545536b0523fe/tomiwexazozizamanafomote.pdfIn PDF document text
    • https://groupekheidri.com/ckfinder/userfiles/files/77563473469.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/22188884404.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bijarowuregejosevov.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/7dd49c41cf3b0cad145773579d737070/juzefegijekovutu.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/40860745160.pdfIn PDF document text
    • http://jiab.net/userData/board/file/lebatukifejaxuz.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/muzikuzifuripodivuzamek.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/puxuxubugogovadenuvodoxur.pdfIn PDF document text
    • https://novsport.com/content/File/20980592124.pdfIn PDF document text
    • https://ostrichtours.com/ckfinder/userfiles/files/58493800180.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/venamufegi.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_off0000fa24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA24 20440 bytes
SHA-256: a69f2720e38fa0750ff99484fefe250f6da9d37456cd063ee88204e3336f3630
font_01_sfnt_off00012dd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000145e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145E7 10468 bytes
SHA-256: a38969deefb5b1670d54d6050952f0f86985e8129280eb466c250521a0b1a47a

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