Malicious PDF — malware analysis report

Static analysis result for SHA-256 f34c0f18cbc65dd3…

MALICIOUS

PDF

80.2 KB Created: 2021-07-01 18:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0ea9e10e044836aef9d41a6e4e6e9302 SHA-1: 4abb8fed095868f6ef64a3c83cebacc1a85b1e32 SHA-256: f34c0f18cbc65dd3187cd455c72ad863b9d37246061e82ecd4d090789c7837bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites and utilizing formcraft/super-forms plugin upload directories. This structure strongly suggests a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection further confirm its malicious nature, with ClamAV identifying it as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3305442e1b---vaxukejizafatamexeko.pdf
    • http://logiccpacma.com/ckfinder/userfiles/files/zixurefajoditebadove.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdbe7dd70fd---revuzire.pdf
    • http://tamker.hu/userfiles/file/28537376714.pdf
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/a265b93fea721cb7120694abecada6ee/mopebepifalakofi.pdf
    • http://palami.by/images/file/xomemusuxo.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/ouc1km4ql67bt8s4f1vsh23lp3/99337561932.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1130cf3cc7---zosekodojomi.pdf
    • http://bike-aholic.com/UserFiles/file/17867488088.pdf
    • http://benjamin1908.com/clients/f/f4/f4560e3fe432b95d15e234f900dec36a/File/76274821489.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/9622d3d731d21148e4eb11bb2f1db591/fidesibenuguwok.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1b6f477f0---89651737818.pdf
    • http://abcbyspu.com/ckfinder/images_store/files/komuwilolenobulowaleje.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/h8gvinocaq0muo253kfu22bfbi/23462172181.pdf
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/7as0ddsl698rr18tes0p22lniu/zivebojisijivarigo.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a67e1b8b78b---bifutixefo.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d86d9885721---vamesugomazovodifa.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/cf0aa64c8dc3e777fbeebaaa47fc26ed/58543963728.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607fff94d3d7e---72549004088.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/2a743d6d44ee88eaeff54f2f6c516318/62815781972.pdf
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0529/59f4a470d4086808bf179e07846f9c8e.pdf
    • http://ucity69.com/clients/861769/File/20096931489.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/5d7tmfs87n58ni2qep7hmg2h6a/guxerafi.pdf
    • http://antansconstructions.com/ckfinder/userfiles/files/zafaw.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=little+creatures+hobsonville
    • 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_off0000d764.bin
f1679765dfcb5f0b97bf9e01edcd7290585fe49e3c963197fa2a12edd1deeb58
pdf-font-stream PDF embedded font (sfnt) at offset 0xD764 10588 bytes
font_01_sfnt_off0000ef8c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8C 16792 bytes
font_02_sfnt_off0001079e.bin
4a0ba3305b100eb9f62f0439faba219a387a5bf4fd10982209a3f72ac1ac09d3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1079E 16924 bytes