Malicious PDF — malware analysis report

Static analysis result for SHA-256 3921b6f5ad8a8a4a…

MALICIOUS

PDF

85.2 KB Created: 2021-09-08 05:07:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 39e730c4ee3224f499cb7f8c99f7ff6d SHA-1: b289edfbd11e3ea0a6444818651709b2c258f125 SHA-256: 3921b6f5ad8a8a4a2d0fb19afa6aaa7cb1275a6f1dbf5a27116084aafc9db8b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs and link farms pointing to other PDF files hosted on various domains, many of which are flagged as potentially compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure suggests a redirection mechanism to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://quincy.pl/ckfinder/userfiles/files/davalojeraxinu.pdf In PDF document text
    • http://theaterbuehne-schwandorf.de/userfiles/file/xisififolovujejajev.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/6810779526.pdfIn PDF document text
    • http://greenbrier101.com/userimages/vemimimi.pdfIn PDF document text
    • http://fygl.net/uploads/file/250125187876.pdfIn PDF document text
    • https://pensiuneaselina.ro/userfiles/file/lewonexalozunesag.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c4afd4c73---rulomi.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/34615923951.pdfIn PDF document text
    • https://drsaman.com/files/94397053460.pdfIn PDF document text
    • http://sutphinsgermanshepherds.com/clients/21958/File/taduxuk.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/pixegu.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16111a24abaaac---42148234775.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/zapures.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac80f7e002c---tudugifijupokivojim.pdfIn PDF document text
    • https://alkoplast.rs/files/josomipidipazogisuvo.pdfIn PDF document text
    • https://webhosting4.net/media/file/velovagulaj.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/28b55fb2f49c0f557588b9efadb8600e/geleguturamofesiludu.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/birularopalu.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/18965218401.pdfIn PDF document text
    • https://capecoralliving.com/media/file/43276788568.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/lm9o9kgn49je2c0rbfripih385/gamalarabit.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/81233151086.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/86785275975.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=smart+bracelet+user+manual+%D8%B4%D8%B1%D8%ADPDF 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_off0000e4ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CA 17888 bytes
SHA-256: 8f163d7d29a52b62d4f3b47ed3e05915644b3372401a13a155d24e1005005612
font_01_sfnt_off0001136a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136A 17188 bytes
SHA-256: 2c92baad260aec650ef8e3ee717f89767b7c74a1517ee8058ef8e7851dfc8555
font_02_sfnt_off00012d18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D18 10496 bytes
SHA-256: ca8e3a681241d2c039272d8bb6ed5c56d6421610e40af52e6ec58af770f4079c

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