Malicious PDF — malware analysis report

Static analysis result for SHA-256 9695cf6b543e0b89…

MALICIOUS

PDF

80.9 KB Created: 2021-09-07 16:37:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ef9918ad611ba673417deb0a8e7a213e SHA-1: 6fe2598bad0298f76bbc6d060f03a2eda468ab63 SHA-256: 9695cf6b543e0b898595bf0c39cb18017e5c585d0842bcdeaf792d7ae8dfa213
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the structure and URL patterns suggest a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 5

  • 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://ip-golubev.ru/ckfinder/userfiles/files/zogewanizikaxanegive.pdf In PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/scrvf2q1bf2fk41p4isltjbu52/79223810103.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/lilorukoniwulokonuvodul.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/37698601982.pdfIn PDF document text
    • https://alev.az/userfiles/file/dezifolibutojonibomizeler.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202109040719125957.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/40l2j65vs6m18vvtpjuh15c6lf/46230975878.pdfIn PDF document text
    • http://ohstigers66.com/clients/d/da/da15611725e7ba20b6827cbf2e24f87d/File/fimubixevasidivim.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/89760508611.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/5e76f01004ab07a954c4332eed6eef92/65168873131.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa016ac408e---gumemimapetebe.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/125f58eafaf8d2b9d44a4a210d4f3d3d/nulor.pdfIn PDF document text
    • https://master-service.ro/images/file/24189780114.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/zodujafofuzinunajunidu.pdfIn PDF document text
    • https://arerp.kr/data/file///55535291527.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/98285936471.pdfIn PDF document text
    • http://cpils.com/userfiles/file/74131294811.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/24700529251.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2c076e405---pewulibematupomosemisavu.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba719ba935---fanukigojodiwusakelulid.pdfIn PDF document text
    • http://coffee33.ru/archive/file/31595530246.pdfIn PDF document text
    • https://airbays.com/userfiles/file/sixibatetenajeropokaw.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/kutekamuberesepu.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/ni3j311ovnmtoie8qc2ckohbl5/jubewevizajavevuzexojep.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/17sjfmd1k42to34a30ud58c7v3/dovofovawifo.pdfIn PDF document text
    • https://scriptdd.com/_file/file/93565744768.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=network+design+proposal+for+bank+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD917 16672 bytes
SHA-256: ad3e6393cbbc47ec428c8ea632b0f2c36697f327a78a9ff02810d3ce55d65387
font_01_sfnt_off0001047d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C94 10968 bytes
SHA-256: bec366793cd6c86d55df11d1fdbf9bd11df8e08deafafc61b46af8b47b460c24