Malicious PDF — malware analysis report

Static analysis result for SHA-256 5602a3c4f3c40234…

MALICIOUS

PDF

81.8 KB Created: 2021-08-09 11:29:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9dfcdfca49b69fef4905dd425e2eff6a SHA-1: 29ef7fd39145ae12147686c3fd2a8b35588c8c76 SHA-256: 5602a3c4f3c40234c49e8d6eee614b8dd3f548415ead8dc7ff47c74ad1b5e14a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to deliver second-stage payloads or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://beastyenergy.com/userfiles/file/9116755740.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087e513aa495---27058819759.pdf
    • http://lucann.com/Upload/file/wapotimelerupa.pdf
    • https://thuaphatlaihoanghuy.com/uploads/files/kasafotevupowab.pdf
    • http://shinies.ru/img/lib/file/vojolokowebokosurug.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160897bc1d0f72---gimiboje.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/04d028df2787d57ecbd1041c76f5ef01/rezufotatu.pdf
    • http://mea-travel.pl/userfiles/file/dafimanupux.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160e9289bf3218---lumejojelesiz.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d1fbfacd2f7---86894592192.pdf
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/8df34a13c33c47cc8d6f653466373226/dusakab.pdf
    • http://dyglas.com/userData/board/file/mumet.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab7304f768---6815403087.pdf
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/45027872635.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/0f25ebeb8437de0b9ed5c3e7593c938c/kuwukexiwabezirefa.pdf
    • http://tpokebar.com/uploads/files/10252015813.pdf
    • http://osteriailgalloelinnamorata.com/userfiles/files/19339914198.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16077757933b1d---monuk.pdf
    • http://pogologistics.com/ckfinder/userfiles/files/kegez.pdf
    • http://big-blue-bus.com/pics/fotos/1/file/gasunibur.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd1ed816f9---27223248339.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a032123fb5b---4164358079.pdf
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a29bce81cd5---15422022746.pdf
    • https://kabelkyaobuv.sk/editor_uploads/files/dimosatopiwutiteb.pdf
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/2010e0c0871733cea0d23c1175af894a/24477788455.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=en+sortant+de+l%27ecole+lyrics
    • 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_off0000da2c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2C 16792 bytes
font_01_sfnt_off0000f243.bin
fd2881a3f4efb0fa3af3d75711aa7adcbda18e50e54861955b86bd3779c32ca4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF243 10496 bytes
font_02_sfnt_off00010a45.bin
f0d9ec44b5ef354746e355a79710673ffdb1590c6142a15e2659806fac448028
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A45 17548 bytes