Malicious PDF — malware analysis report

Static analysis result for SHA-256 079ee43a4857076b…

MALICIOUS

PDF

69.8 KB Created: 2021-09-17 15:22:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a35ae4057eed2b6270e27a5a1ef1f1ec SHA-1: 20484cb1208934d8621da9e3468a58399f558d3a SHA-256: 079ee43a4857076b55dc7d6162e20045133e92af74fe829b0927b903171c35de
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The presence of these links indicates an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://auto4-spb.ru/public/images/ckfinder/files/mepenezes.pdf In PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7634eac140f5e0d68328c6ac3cc4fc16/4281229387.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/man8emdoh6qrmoukhvefbo62q5/sufagopadowofofaw.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/gubewosidirapidos.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/ramewawaxobave.pdfIn PDF document text
    • https://iphastkala.com/userfiles/file/23807266606.pdfIn PDF document text
    • http://inwama4.vn/webroot/img/files/riwaxo.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/vesizokoxetufomagojeg.pdfIn PDF document text
    • http://fmdscu.net/userfiles/file/51357625643.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2d046f570---64316887073.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/15358090387.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/latutugomofexavojifu.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/dasexugapaxosidew.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/b16a9c90cabcb166b3cfecba5f02e957/4786092940.pdfIn PDF document text
    • https://812423.qqtogeljackpot2.com/contents/files/wamewuwunafinopave.pdfIn PDF document text
    • http://sakem.org/userfiles/files/lajosiruzopinaxewijuv.pdfIn PDF document text
    • https://thefencedocumentary.ca/adminfiles/file/41535864664.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/fevekopegofoludafu.pdfIn PDF document text
    • http://dioblina.eu/userfiles/file/finupideligudabuki.pdfIn PDF document text
    • https://renetravel.ro/images/files/96070763438.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/nepijak.pdfIn PDF document text
    • http://myslizdrave.com/soubory/bosarorabesijibanidopibu.pdfIn PDF document text
    • http://acril.ru/ufiles/files/32910483590.pdfIn PDF document text
    • http://futsalcb.cz/picture/vtextu/file/kepewewitaxarobelekevam.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135e811c284f---48531282983.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/jopetotamob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=rlcraft+download+androidPDF link annotation
    • 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_off0000b56c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB56C 14596 bytes
SHA-256: 847670983d8e7946c393c4582b6ca9371db70da0ddcf3c0a16a957e0186cc0fb
font_01_sfnt_off0000da01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA01 10300 bytes
SHA-256: 08f78a140dbaea385bb7a43c8c2099266f0647b866cb69c530ad837f2ee1678a
font_02_sfnt_off0000f161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF161 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1