Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec26fec255db2d70…

MALICIOUS

PDF

97.4 KB Created: 2021-06-25 21:08:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9acfa9886110b4e848c4f8ec9b2162ae SHA-1: dcb5c61ec445c8247cf07ae1944978c055930566 SHA-256: ec26fec255db2d704eb7d16c89a9287b2a92846e629b49cbea4a503c9e000959
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs that point to compromised websites, likely intended to lure users into phishing scams or malware downloads. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, as these rules flag PDFs used for SEO manipulation and hosting malicious content on compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://irlanc.ru/uplcv?utm_term=golden+eagle+hunting+wolf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/vdofdolofdpvhuh94pf9g99tm1/witomotapiwebamuvetix.pdf
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/75637e5a61d089bab713ca9762451ffc/46985639959.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd3dc87b88---meluvodobuzumejepenemo.pdf
    • https://marblobathware.com/app/webroot/img/files/32402957662.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/e7e7daef219c7e67fb8521f9100630f7/zivujesoluso.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cb3ce88ef---27977306326.pdf
    • http://asbu.net/uploads/FCK_files/file/15283632581.pdf
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/532023ffdcafeb9e70bbba1c7c69bb4d/tewexovopogafomexe.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609331b9d8478---55130336057.pdf
    • https://bravo-hk.com/userfiles/file/foxinilova.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726dcbed443---5298457391.pdf
    • https://astek-telem.fr/userfiles/file/575411951.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ec1f3b885---79836078725.pdf
    • https://fedico.ca/upload/editor/file/luxopimo.pdf
    • https://toppelletmachine.com/d/files/suwatedusozav.pdf
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/6543e4adee67e6a1ca86794ef6e17bd9/44067561480.pdf
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/p6egkrcqu8bbsqif6j6q92uvm4/4001332721.pdf
    • https://bczenekar.hu/files/file/18758383460.pdf
    • http://jarauwerdaenzn.nl/userfiles/file/12050585790.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/51944c3fd9863a0d4ea92dec05f05d2f/60200837347.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160abe14092d5b---votupupa.pdf
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160b49b28265a3---24015123460.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/tm100of0oqmi8icijk7p1n1gd3/60255553507.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/81bc309618f8dd8e17f94b325e57eeaf/18029780904.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/ikb8kn6cqbmm909ie90s1chep4/33753628279.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_off000119b3.bin
9a3e1f6066d0b569e1addf0543345df2cd214b21028dba306493927eee4ee684		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119B3 10592 bytes
font_01_sfnt_off000131ac.bin
664e61cf669c2aa99847053665ad70ef3a3de52f61610f692e57d72c6d1e146f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x131AC 17652 bytes
font_02_sfnt_off00016043.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16043 16792 bytes

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