Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5afc6c18cfe7cff…

MALICIOUS

PDF

84.5 KB Created: 2021-09-12 20:31:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 49f1253989087ec2aff8ee8aed2ce17b SHA-1: cb41395971ba746a5e9a50482a10012babebb837 SHA-256: e5afc6c18cfe7cff05826c533adbc0de6e871877cf36ef8f3ee41789a56f2de3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS upload storage, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://wastran.ru/uplcv?utm_term=the+adventures+of+tom+sawyer+book+pdf+free+download
    • https://tucarrorentacar.co/ckfinder/userfiles/files/55152987456.pdf
    • http://whatifitspossible.com/ckfinder/userfiles/files/nutelewebozekitiwewo.pdf
    • http://ekotop.eu/userfiles/file/pezipu.pdf
    • http://boxerdapolenta.com/cmsimple/images/file/59164163368.pdf
    • http://vodnik48.ru/content/file/56459414273.pdf
    • http://elitsatodorova.com/uploadfiles/file/domox.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613065b7e1da7---vinifufak.pdf
    • https://tenekedjieva.com/uploads/file/koxakivafatititadik.pdf
    • https://artcorner-fiberglass.com/userfiles/files/88207534252.pdf
    • http://zapatosperezcabrera.com/ckfinder/userfiles/files/ruwusatakezifili.pdf
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/d7ec73b90315bfa6a5fc0f6793b7b5c6/luxaru.pdf
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16137281472bbc---labikizifubaguzebax.pdf
    • http://isystem.hu/userfiles/file/gidedojowufo.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0687d27c4---9482399584.pdf
    • http://itcbeautytrainingschool.com/userfiles/file/lutofaduretelojaxakulol.pdf
    • https://sklep-pinokio.pl/web/uploads/files/89824605249.pdf
    • https://jmtours.co/aym_image/files/danam.pdf
    • http://m-s-g.ru/userfiles/files/8225450972.pdf
    • https://jgranit.pl/userfiles/file/7524205938.pdf
    • http://studiopedrazzini.eu/userfiles/files/70778681683.pdf
    • http://abwlondonblvd.com/uploads/files/60084307737.pdf
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/71430977916.pdf
    • https://lensmam.com/userfiles/file/97664299855.pdf
    • http://preciz.com/uploads/wysiwyg/files/fisedelojado.pdf
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/92456546104.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da07.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA07 16792 bytes
font_01_sfnt_off0000f219.bin
e17c9c35a3e26c99c05630e026c65232d76c8991a2fe8cf1ff0ed601600baf52
pdf-font-stream PDF embedded font (sfnt) at offset 0xF219 20844 bytes
font_02_sfnt_off00012990.bin
e93b08abb1d15684f6cd9567248bdc7e81893db49b5bba38e3fbbeb414f0ea7e
pdf-font-stream PDF embedded font (sfnt) at offset 0x12990 11232 bytes