Malicious PDF — malware analysis report

Static analysis result for SHA-256 253c761b0d7d0249…

MALICIOUS

PDF

102.0 KB Created: 2021-06-25 19:58:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8c8b26511ca5a78da5cc5b2220958e5b SHA-1: 789709797bbdbaa30092990c6c2c965ea088fd75 SHA-256: 253c761b0d7d0249603ff9b1b6f0fbf4d9be62fd4c521670ebfa885c6a7141bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9803

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://taikenplan.jp/ckfinder/userfiles/files/10773968902.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7f7b73fe3---49067583857.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/d8135885d8cf375d26796298453bd195/nizovutexijowen.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839038269f8---wijetemijixod.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/40b4a8cb1a762dc2550fab48db8b78b9/siriwasoditaxa.pdf
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/bq8scg2744mu98dtfqs0mn2g8q/19757650500.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/39ab6bbffb6ce040a00f2c9d64c1f474/14932563537.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f08d0b769---rujijujizutoge.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae30149cbf2---56437549221.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075de89bc693---32923454354.pdf
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/d61eff4a955a3cf8d40699c03d81bc6c/xamoze.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608f905a79c6a---gemibofodemupam.pdf
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/berrcpg3mieg94re2tu2df5o7s/tuwubekesopetikod.pdf
    • http://anhuicrew.com/upload_fck/file/2021-4-29/20210429014450872375.pdf
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/c5c132ded772e8554cca899b8583be6b/vukijimu.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/ph6nbque883vi87j1obb5civ2s/zuwewafivarokexajinuzali.pdf
    • http://radio6deenero.com/uploaded/files/nusutapakuvamilo.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/9861394b851ac746a916793575c666e3/difirivedibam.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c44a324567b---90968659628.pdf
    • https://uleiuri.ro/userfiles/file/jiwewufezilufaxiwed.pdf
    • http://lateonsettay-sachs.org/userfiles/file/libunovuxokugafuvolax.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8df12f042---pezulopemejajakoron.pdf
    • http://skncn.com/u/files/45821435657.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1606d029ebe10f---8429658531.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/6tu15biv6rhfbk3hs297tpnesq/dupobunapebebozedaxevapav.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/k2abmpnj7hv1iktlp90uej38o7/59550616126.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=another+word+for+severe
    • 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_off00012e1b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E1B 16792 bytes
font_01_sfnt_off00014632.bin
0bca79d05a2cd920224b3cc38834f78e832418c9c3407c6f1382af1f1e81d21e
pdf-font-stream PDF embedded font (sfnt) at offset 0x14632 10284 bytes
font_02_sfnt_off00015d64.bin
ea950cac18f83f0bd193aa61ce329aa86de304b2ebf29c5f7ec88e16fb3aac07
pdf-font-stream PDF embedded font (sfnt) at offset 0x15D64 16800 bytes