Malicious PDF — malware analysis report

Static analysis result for SHA-256 cffb8ab1187056f9…

MALICIOUS

PDF

86.3 KB Created: 2021-09-02 16:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 053b692e70eb5d743ad76fe081a4ed70 SHA-1: 8404fef07f23b30f7355404836a290bdfbb9d6b3 SHA-256: cffb8ab1187056f902ba0d662dc09bf4cbd76549843564862eb7ac2fee21c79c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely serve to redirect users to phishing pages or download further malicious payloads, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crewmak.ru/uplcv?utm_term=addicted+to+you+pdf PDF link annotation
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/f2d1d909231b3092fd7b6e8ac712c5b3/73924285989.pdfIn PDF document text
    • http://riviera.az/userfiles/file/62806188103.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/270ed502da89e0fd130e2e4584a212d1/69968240114.pdfIn PDF document text
    • http://101balkon.ru/upload/files/47828143290.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160b56a1c86c3d---powejuwomuwuziteke.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/052c2516c0a82cbfc244316acbbf3adc/xijas.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/6528214352.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be48f055f5a---gofamuxifukatoj.pdfIn PDF document text
    • https://wecareprogram.org/images/file/67920576908.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/91082322447.pdfIn PDF document text
    • http://smit-electronic.hr/upload/datoteke/biziwilitabetolojelinat.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/dusalinudalarijed.pdfIn PDF document text
    • https://ivanamihic.com//files/80578491367.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202108180920428733.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/e3eo0s6doco3obe95qfqtd2v4e/28846816820.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/7vf4piss5qfu3c4j3bpilq08gb/20253685551.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/09231647ff530acea0b2f6ffc0818429/62827410557.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202108130945574593.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/af8dd66a10ca6e7ad7dd4a98bb428d56/64034694313.pdfIn PDF document text
    • http://gibisch.org/files/files/79807015870.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16076a3109c6ec---gutupepum.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/badinejaregalowibusekeveg.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/f194da795cd632a39d9fc34f58306ddc/13367050894.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f98f5e3cae0---96878212350.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af7631e0d4f---11070980587.pdfIn PDF document text
    • 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_off0000ee8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A3 10228 bytes
SHA-256: e25e37ea63c7e725fd2f7f5a561b3ff13c9eec7292ba32b00a57dc513102a74c
font_02_sfnt_off00011dc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC4 17996 bytes
SHA-256: 1fec1c9cd998335c8a3447f45fd6c839feabe1e82d99265241569d354d44ecdc

Open this report in the interactive analyzer, or submit your own file for analysis.