Malicious PDF — malware analysis report

Static analysis result for SHA-256 941a65d316ba8556…

MALICIOUS

PDF

81.9 KB Created: 2021-09-16 09:37:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bced8aab73faeed13ab977b07e6775ee SHA-1: 14c1906f0bdacac781edfe6425dc06162ea12c51 SHA-256: 941a65d316ba8556a0b621898cfe8db9781425ae97f22c8e8752409442be5f69
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also features numerous external links, some pointing to compromised WordPress sites and others to disposable hosting, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://immobiliareincentro.it/allegati/file/menimitezufu.pdf
    • http://meijialx.com/ckfinder/userfiles/files/difafanuliz.pdf
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/76555984554.pdf
    • http://gold-carsales.com/js/upload/files/wekefijidodozaroxizam.pdf
    • http://www.polni.si/Images/files/30013261097.pdf
    • http://vanillasky-ch.com/images/files/2832690353.pdf
    • http://missteenqueenuk.com/userfiles/file/kizip.pdf
    • http://amghanoi.com/images/ckeditor/files/57004535435.pdf
    • http://salamatekhanevadeh.ir/ckeditor/files/files/94274704976.pdf
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/visedakowovedagegewawup.pdf
    • http://taaltoetsvo.nl/userfiles/file/40773975533.pdf
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/vejanonaxulerisimamurapo.pdf
    • http://corising.info/sa_upload/userfiles/file/20210916064508.pdf
    • http://www.pattyn360.com/upload/forum/files/44024487055.pdf
    • http://boldogelet.hu/media/52860146884.pdf
    • http://ankaraeksioglu.com/resimler/files/sifosukubotakebedat.pdf
    • https://xpress2.eu/ckfinder/userfiles/files/55318783078.pdf
    • http://zsmnowakowski.pl/userfiles/file/99759932452.pdf
    • https://festival-bg.com/media/ckuploads/files/55771198623.pdf
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16140e86082ab4---94968830249.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/376n8djjqlrm315c3vcb0pk0oc/lonatesamegad.pdf
    • https://plewmal-d.com/Uploads/files/84738125293.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/69e0e9bc3af0e0f62cc587de2c2b0da6/14721742537.pdf
    • http://outspokenholland.com/userfiles/fckFile/20210912235844.pdf
    • https://incoyun.com/calisma2/files/uploads/64248763350.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=camera+360+old+version+download
    • 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_off0000d9ad.bin
00c7285c3d0153e6907d51f9bab13c3165202efb68942f3e291bb3ae2bc377ee
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AD 18180 bytes
font_01_sfnt_off0001090c.bin
b696adb9a511656d2fdf0aa5a4ee52f300b3c4d5621805872032d56c28b93bad
pdf-font-stream PDF embedded font (sfnt) at offset 0x1090C 10956 bytes
font_02_sfnt_off00012277.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12277 16792 bytes