Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf2cf12b8f789cf9…

MALICIOUS

PDF

94.0 KB Created: 2021-06-28 17:08:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a259ec51ee9c032da68026d15db3b187 SHA-1: d696d17e7cd59a25d237f8321a90f63aec3a4a0d SHA-256: bf2cf12b8f789cf953f2d19b4f5a449b1eb7d8827e7a315a0067c9f7d82d5ae2
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern observed is the use of a link farm to direct users to potentially malicious content hosted on compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c441de5bb---75769387642.pdf
    • https://allcreaturesinc.com/files/files/xugotutaredidedukafajo.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b161a5ca6c3---lodoporobujovudakaxopisu.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/ffda6bdca807ff46a6dbbcafb0986a1f/65837985738.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160988a0c679e5---ruxotexuxelaralit.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16081cb528fa66---lotasixiponebujixu.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/df5f2c4ed3655952431bf257aa99713f/96550660313.pdf
    • http://builderall.info/userfiles/file/dubegesajuma.pdf
    • https://eastmanllc.net/ckfinder/userfiles/files/91513406493.pdf
    • https://avenue102.com/uploads/file/668068292.pdf
    • http://allycatering.com/userfiles/xalutesunemamajimetusaw.pdf
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082acfcd2120---11827211162.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/211ecf41a50d4e758e2df80a61734f81/67683232772.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160984a18daf1d---suvexewofepetosivananaso.pdf
    • http://brette-animation.com/userfiles/file/80390703026.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/74q7sfn3km7h424n510afp6cn4/82483581683.pdf
    • https://lotte-ppta.com/beta/assets/file/24432712170.pdf
    • http://selfmadefilms.nl/userfiles/files/jajiwitu.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c69be2f3951---92562037944.pdf
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/9ar5g98vsmm1sdi47gtl8iraif/65895890671.pdf
    • http://cpbnatation.fr/fckeditor/userfiles/file/82329738322.pdf
    • http://iccj.jp/images/uploads/fckeditor/file/62005023222.pdf
    • http://immodraft.nrw/images/architekten_agentur_images_/file/45839432020.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/b72iap150jbr8jroc9ukr16t2o/44602645810.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=pumpkin+patch+and+haunted+house
    • 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_off00010c62.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C62 16792 bytes
font_01_sfnt_off00012474.bin
868a078a46c4147831cc26b4b9a4b059ca743a9bc580e8691020fe32bb6942f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x12474 17340 bytes
font_02_sfnt_off00015226.bin
ce6c7b6fd61039ae49225300674472208c0500edbf74bf4ae724926993c29d4d
pdf-font-stream PDF embedded font (sfnt) at offset 0x15226 10824 bytes