Malicious PDF — malware analysis report

Static analysis result for SHA-256 6825aa71ed7f0edb…

MALICIOUS

PDF

88.5 KB Created: 2021-07-02 05:47:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2c250800e511aa8dc8d6c80913e1c9b5 SHA-1: c2e25ce352033cc9d8951e9b090aa9f45d6c8521 SHA-256: 6825aa71ed7f0edbb9ee1eabf0ea5a2f7ba561764d9214e2f1b60fdf66d2276b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. The PDF structure and embedded links suggest an attempt to exploit users by directing them to malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://altaprecision.com/userfiles/file/kidosekujasojanikowafinez.pdf
    • http://khanaphatgroup.com/UserFiles/file/26292587830.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0140da34d---4300639955.pdf
    • http://changdahk.com/upload/puzerubukevasapixagi.pdf
    • http://azizolace.cz/images/file/50065844709.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d048d81d3ef---rifegugarefomasi.pdf
    • http://say-international.eu/userfiles/file/wasotoviletibetuna.pdf
    • https://zifu-tech.com/app/webroot/userfiles/files/gaxogogorazev.pdf
    • http://kco.su/userfiles/file/pomewatewidajatejuf.pdf
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/wakuvazidalexej.pdf
    • http://kiemtoanhaiphong.vn/upload/files/51776623959.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609a47d01379e---97274740340.pdf
    • http://starkhigh1972.com/clients/d/dd/dd83d6d7846a033806cdb512e10d7d7c/File/56980174055.pdf
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/dakivew.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160976ca02f658---26692584500.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5787f2d753---muwovujamudexopofevilufef.pdf
    • http://hamdard.com/hamdard/app/webroot/img/ckfinder/userfiles/files/pigabexuxider.pdf
    • http://studiotipaldo.com/userfiles/files/13871148954.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090bc147d519---pesilagafukunanaja.pdf
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/52115126433.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16080c7b19bfe2---8524188888.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16075fbe4475f4---3987261672.pdf
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/petagi.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/f76a18662084e44e873d1541c8d95160/11449103941.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e85e25818---21490161531.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=swelling+in+armpit
    • 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_off0000f643.bin
821ca60bac727706cd88f45677977f99d558daa43e5c35f2595716939458891a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF643 17328 bytes
font_01_sfnt_off00012387.bin
369a20bb5028f0ffe36e85b1654e3c20841bc8c4d800f3727c44046a13f49b99
pdf-font-stream PDF embedded font (sfnt) at offset 0x12387 10468 bytes
font_02_sfnt_off00013b5c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B5C 16792 bytes