Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a168bb24bc10569…

MALICIOUS

PDF

80.5 KB Created: 2021-09-19 03:54:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6d915dc65a52a146542623fa1489dba2 SHA-1: 65aec11f970e2f445f883dcb23ac5e41b70e152a SHA-256: 4a168bb24bc105697ed919842badec32b217564daa541e79472c69d80dc0f33d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous external links, many pointing to potentially compromised or disposable domains, characteristic of a link farm used for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest an intent to redirect users to malicious content, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://nedimgame.net/calisma2/files/uploads/25870732776.pdf In PDF document text
    • http://liavanhaeringen.nl/userfiles/files/69841925683.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/29584307224.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202109012257262856.pdfIn PDF document text
    • http://cocoabuterol.com/upload/files/39169481447.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210902103114.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/lokalefivuvawivebaw.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/winivabur.pdfIn PDF document text
    • http://yuc-fac.com/uploadfiles/20210910000855.pdfIn PDF document text
    • http://manuale.aziendasulweb.it/userfiles/files/sikag.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/10060147594.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f21fc48f11---tataniligop.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16137faab5d65c---71852610695.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/96653813433.pdfIn PDF document text
    • https://danielfelber.ch/userfiles/file/38552685632.pdfIn PDF document text
    • https://angem.fr/userfiles/file/dotudupi.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/34684562053.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16140bfbfe6409---navuzikelukaju.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/64142472071.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/gobekewidiro.pdfIn PDF document text
    • https://photojet.net/userfiles/file/jirenefimevo.pdfIn PDF document text
    • http://chinahongji.com/d/files/sumejagajugi.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/wefabe.pdfIn PDF document text
    • https://cargobull.cz/res/file/vajokobigegenuvogo.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144cda1bb990---53434653239.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=barbie+mariposa+2008+full+moviePDF 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_off0000cfe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE4 11124 bytes
SHA-256: 4083d9dff67f39b0725b94e95a8bffcf95b4c1cfc6b1af025fbfe4f16faf14d2
font_01_sfnt_off0000e9b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B8 19308 bytes
SHA-256: a6c758a43e9514f990964aaf32bac2909aea6ab54d436db8f76b503053eb522f
font_02_sfnt_off00011c1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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