Malicious PDF — malware analysis report

Static analysis result for SHA-256 8acdcb25345f6764…

MALICIOUS

PDF

80.3 KB Created: 2021-07-19 15:19:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7eecf8c55daa6a067ebeaddea901c3d4 SHA-1: 8085401dda3e852b5d025d68a49c8af6a2c606a3 SHA-256: 8acdcb25345f676464f59f103ba74da1f89895ae33b50c2e5ebcd97279a993f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/tq3u40ofpl8ntkdlmk2k3vtprm/7394278507.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/935ab9a5b445c8b9b86c45216caa2648/4821319039.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/gt13c1t76m88881e43j1tj04a8/zowuleborufurabugu.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ece6f14bcf---pujadorusago.pdf
    • https://myphambambi.com/webroot/img/files/bezefatunigolo.pdf
    • https://ctapigroup3.com/contents//files/gexibuwodotemo.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/ui8o6khlijviav7fga1uppbro7/xovuwi.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608495c26de10---welikagofodirajaduneze.pdf
    • https://gute-reise.ru/i/files/files/60213095176.pdf
    • https://madspot.dk/ckfinder/userfiles/files/zegogogejufuwuvit.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b09727bc690---lofob.pdf
    • http://www.allatpatikapecs.hu/images/file/barupoxabaroginulafudotis.pdf
    • https://olympicwroclaw.pl/zdjecia/fck/file/76391886213.pdf
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/igfj0970rmfe2ea34pblqj87h4/74998497561.pdf
    • http://m2mus.pro/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/50386204517.pdf
    • http://rgn2u.com/userfiles/files/15116554338.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608927dfb3be3---kezuvid.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/v2nprg1f9ph4os8o9ope72g0rt/45574085722.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/vmlpu8lp5rneitjctreh3cdcu1/19555270879.pdf
    • http://sosnovgeo.ru/userfiles/file/tokoreve.pdf
    • https://t2sc.me/userfiles/64111423147.pdf
    • http://unseretochter.com/images/file/vusekenisuboza.pdf
    • http://gtshotel.it/images/file/95714873305.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=shell+shockers+space
    • 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_off0000d89b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD89B 16792 bytes
font_01_sfnt_off0000f0b2.bin
4acf193457db070b15bb15419d8bdf7f4c240d8c083370433807ac6f279e1be2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B2 10344 bytes
font_02_sfnt_off00010836.bin
3be9deb40599e5471204f77e53d5ed7d6d205a27362af9acc5635116309c117f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10836 16880 bytes