Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bb7efb335ca4859…

MALICIOUS

PDF

88.8 KB Created: 2021-09-07 23:23:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 969da4851b8f3ce31841d8559b09fa79 SHA-1: 545474298a5429f6480b76c6cbdd9c5507a970f7 SHA-256: 6bb7efb335ca4859090a07267e30bde30d04361155232b897153c2a03c38c313
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of external URIs and link farms suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://overtonnation.com/clients/f/f9/f97855507a39dfa58978186db9bff07a/File/tejewujifemawidexunemelov.pdf
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbb437194f---nuxaniroxepurepasiri.pdf
    • http://sddshchb.com/userfiles/file/Fl202107241722544113.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/augkuvf90c8jfsjada56puomna/zekumewedome.pdf
    • http://qwerty.pl/_data/file/fodisab.pdf
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/ipu3ici5gh443nm5vk5onruavu/nopituzuradamekegiw.pdf
    • https://medpressa.ru/files/file/86710517669.pdf
    • https://tyeetomsfishing.com/userfiles/file/rabarusabajalajeto.pdf
    • http://burelomdo.com/ckfinder/userfiles/files/gujotenevuratot.pdf
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c9dd60368f9---zeleruporafozak.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160fe57b947a10---merunipalopugimowapopogav.pdf
    • http://aimic.com/userfiles/file/81509726000.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad422733f5---24108973062.pdf
    • http://nage-z.com/ckfinder/userfiles/files/leduridemenabavi.pdf
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/f2c4365142d837eb34e391bbc7e98186/54903990849.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160af81aa2bbe4---36194198104.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074bb8374995---vifafamikaberetadeg.pdf
    • https://atrax.eu/userfiles/file/zofij.pdf
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/ee815c3c4a175a0bf213fcadfe3ed8aa/5133501300.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0575320fc---gifuti.pdf
    • https://koncnc.com/genelresimler/file/81788297033.pdf
    • https://planet-for-events.de/userfiles/file/puvodipurinavelazu.pdf
    • http://iworking.vn/uploads/files/zapazakarabu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=themen+aktuell+1+pdf+free+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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb45.bin
af0e9c4b9f295cf333328b46e6cd12421a6f284e1033c3ce9c33f06c0e0c6137		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB45 10796 bytes
font_01_sfnt_off0000e407.bin
c3e008f58aada6d1ae44872f507ec427e7270eed225eb9cb02ee56d158559dc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE407 23252 bytes
font_02_sfnt_off00011dad.bin
e11639021ae82bc81d66597892112dbefd7f2cb67f426bbebb6fc3c29591e729		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAD 1840 bytes
font_03_sfnt_off00012654.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12654 16792 bytes
font_04_sfnt_off00013e65.bin
252c6c62735cac1312d5cff9624492d21d9f99093cce57c742834cabec47c65b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13E65 16184 bytes

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