Malicious PDF — malware analysis report

Static analysis result for SHA-256 43b9ae73b9e17aca…

MALICIOUS

PDF

96.5 KB Created: 2021-06-26 03:05:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 25027543f99da36d27d2ea4024e83c1d SHA-1: 303e7ad1a136ea425f18f7cd2837d7ffe8826c27 SHA-256: 43b9ae73b9e17acabc5b697a5e441d9674f7da383a0cbf828ac3b390b7a28016
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are indicative of a spearphishing attachment, likely leading users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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 https://garglob.ru/uplcv?utm_term=god+our+help+in+ages+past
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e73e1d40f---84965852780.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/e164c7444e6e78cbfd4460de16e27c5c/lujatanoxonuke.pdf
    • https://ddshower.com/ckfinder/userfiles/files/51267674865.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee8476ac52---wejevikuz.pdf
    • http://hayatteknoloji.com/webimage/file/nolovijigi.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a961ac3b73b---39862892564.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16098536908d40---77513619190.pdf
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/55165465426.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/e977279b6ee3e120ed4ea44fb54cff3e/76429023109.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c28e43686---66705810965.pdf
    • http://stinpo.com/ckfinder/userfiles/files/goroxuzisigawinukiro.pdf
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/38a5456be112c282fceea4149f6b9b56/wapubixepuket.pdf
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/zesomivazalulefoxuwitar.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/05db7e35371d0bd3e9c7bf891a89ee0e/zipipa.pdf
    • https://yuss.it/file/giluzafelewozez.pdf
    • http://yournamebadges.com/withyourdog/cms_uploads/file/9179594475.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d30994dbaa---zijebonisulibatumutazej.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16075489f5d9dc---64945640142.pdf
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/5b74ceecc845afca6799a813f791629d/83682472833.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/i3v52ttjvcivnqfam3o2vvspg6/43572056810.pdf
    • https://bikeid.net/ckfinder/userfiles/files/fixomififojepuxav.pdf
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5db885f6ca---87006036238.pdf
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/ea3ef3f3f902d0ade942bf5fc43f7db7/dizimofiruwi.pdf
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16085d340710c3---kobokajedixideketojitiked.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b882b767102---79901856207.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607951324eeac---dazikofaso.pdf
    • 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_off0001180f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1180F 16792 bytes
font_01_sfnt_off00013021.bin
efa4f8b4c415a38c51d73982b16c5b0b1731c695580ed4c204ba3ee7850ef04d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13021 16988 bytes
font_02_sfnt_off00015c53.bin
d5f6ed99deccb8dbacda2ed8e308df10a43aef814cc5604b89860258bb64e624		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15C53 10808 bytes

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