Malicious PDF — malware analysis report

Static analysis result for SHA-256 b54f599df9a9704d…

MALICIOUS

PDF

79.1 KB Created: 2021-07-02 01:18:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a1316eb69b17d76e0aef243361b49601 SHA-1: 5e77630582bd1ab02112dd47df118da45e581f6a SHA-256: b54f599df9a9704da60a8a395b16d05f3d170caad074f1357714ee59792e3c4f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3067e844c7---xerivovido.pdf
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/59acc22941a8a20fc16df7b0fd3775f2/23228592576.pdf
    • http://manavpublicschool.org/manav/userfiles/file/gezujogitesajevaritetaben.pdf
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/3f961b9771f1a8951a26197579c2441d/3131530246.pdf
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/4ummn5g3fq53v8r0imn6d1k4i7/99928151911.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f7f05464c---tegutofobanekajixibenekon.pdf
    • http://studiomuraca.eu/userfiles/files/lopixititewezadame.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f119e3a5ae---giloke.pdf
    • https://apc-algercentre.dz/ckfinder/userfiles/files/wavagijatiboligoburuvor.pdf
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/c1924593ed2a0509a6d1dbd9c0ff7b12/11235681022.pdf
    • http://blueyee.com/upload/file/250213243751.pdf
    • https://malashealthcare.com/userfiles/files/zepimudifemodivig.pdf
    • http://amphorabeautyclub.com/campannas/file/noludixolonusufe.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bc05a4b5102---moripudamotimowikabop.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607668ede999c---286608066.pdf
    • http://cooper1972.com/clients/b/b4/b451ebb09e7e0345645526f893d9a49e/File/98510422253.pdf
    • https://holocaustresearch.pl/nowy/photo/file/93300478156.pdf
    • http://extracam.es/app/webroot/arxius/file/suxigawinafanu.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-4-29/20210429174542475431.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097142c336d6---jafutodota.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608566a3d6e9a---28426269258.pdf
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/c9f46e0626dd93c6f824363de6b58db8/zitikudaviwedaxo.pdf
    • http://vom-ragnaroek.de/uploads/file/zegematew.pdf
    • http://poorclarescork.ie/images/watomokisam.pdf
    • http://murphysbeads.com/clients/54316/File/69495498645.pdf
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/32ef14dc1fd2d6558ff3a1c9448afc25/63140097744.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=provisional+license+to+full+license
    • 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_off0000d3ee.bin
0dddaf7c06aceb85096dfe617ed00ae5fff54f1e97d8c465cf13d945e516d00d
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EE 16396 bytes
font_01_sfnt_off0000febb.bin
dbcd1ee811d1d2145347f27f301db4be9d9b2f2fe40e79872effe790ffc30895
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBB 10496 bytes
font_02_sfnt_off000116d2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x116D2 16792 bytes