Malicious PDF — malware analysis report

Static analysis result for SHA-256 72678fde74da15e5…

MALICIOUS

PDF

85.1 KB Created: 2021-09-23 00:10:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6f378c88bd2a4baaad3f2d7eaa8fcdc5 SHA-1: 3724127b9b280a992a4b7cbea74c1426dabb6fc7 SHA-256: 72678fde74da15e5b72b4d6c13ecc1f61ae1e767bc0547e82c08429917ee686b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://wmc21.com/ckupload/files/moxitovagedanegiligizem.pdf
    • http://dentalclinicbangalore.com/uploads/52586040103.pdf
    • https://y3stwk65l-mn9.com/contents/files/20669251240.pdf
    • http://brukbet.com/user_images/file/xelog.pdf
    • http://4seasonstours.in/userfiles/file/xofufefofumabokewemitew.pdf
    • http://napiarsaigh.com/images/gajed.pdf
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/0148fd1f27fdcd3608d1092812db5e6d/sepaxuwujisuse.pdf
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/pilap.pdf
    • http://stoewebdesign.no/userfiles/file/92214338302.pdf
    • http://italy-ex.com/images/blog/file/kekuzotu.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613631853ecbb---65009780283.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16149dc38f26b4---7765296031.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/g3b4t6iittimvhuvmpko37lt0e/69832908669.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/fd82b8ca594c11d24ea218993fbfbcf0/muserejorev.pdf
    • http://lulanjina.net/upload/files/lanifuvibixibetatilap.pdf
    • https://smilaxlabs.com/userfiles/files/pefananatasibaket.pdf
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/dbg5h2b64cs3hs4oanagil7bigsf3kdo/11423361226.pdf
    • http://consorzio-csa.it/userfiles/files/tazejulunuvawuvo.pdf
    • https://blugarden.eu/file/33194679600.pdf
    • http://limeitec.com/upfiles/editor/files/92958231180.pdf
    • http://damutech.kz/upload/2021/09files/210901093311298061jta35.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/161401857e5158---fedakemolok.pdf
    • http://philipsphotographystudio.com/mojipiwuxupimidodisibi.pdf
    • http://reafamily.lt/ckfinder/userfiles/files/rorulevo.pdf
    • http://vistobrasil.net/uploads/file/darugosematotuzilexavafuz.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=sensilag+2+free+fire
    • 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_off0000eb0a.bin
c9e184d99ce571498dc291237858b491f078260111a73f54df947a516c75ed5b
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0A 10364 bytes
font_01_sfnt_off00010295.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10295 16792 bytes
font_02_sfnt_off00011aa7.bin
513ee6f2ac7b6210d615abe99805eca8e590041d013da6856c538e5825d3906f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA7 17212 bytes