Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5d91a85f763908a…

MALICIOUS

PDF

86.9 KB Created: 2021-07-24 02:13:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c0bb3b1e5ffb5dc424fcf3f7ad0178b7 SHA-1: 85de2691be2a7436ebe91a80aff272b80aa405dc SHA-256: b5d91a85f763908ab87363ce87be43153aaa0af5e168eb5fe7d39a8c7e61ae54
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which point to websites hosted on compromised CMS platforms or utilize disposable hosting, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://hungthanhauto.com/luutru/files/gatajepawuwuwilinige.pdf In PDF document text
    • http://salukool.ee/upload/userfiles/file/42844056495.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/nojewapasedizuzibasinafe.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/mupazabasox.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ddb109932d4---vexalubirilejivi.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/1mv4ip8q0s680vs4i84gjqbnp4/vokidawemale.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/7232271060.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/flus3rvsu8irgauhdn3ji1ja8e/lozakabimerizibisu.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/843ab411f11345bce4fe90d5e2b8316a/luzegesavavidokif.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/56207230281.pdfIn PDF document text
    • https://ferropula.hr/files/raxezil.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/62705538387.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/bidenebolixozewusimo.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cd386bfe4---23854722247.pdfIn PDF document text
    • http://sowitech.vn/upload/files/54674420118.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b114ac70a3c---63328585861.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083889738902---sadur.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/91683503953.pdfIn PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/81126578768.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609882433caf7---kovukun.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/24959075319.pdfIn PDF document text
    • http://dejede.com/userfiles/file/91182522999.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/75913698171.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16077484cea44f---29404180551.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/46702d8cf6982b21f5dc982528c980ff/berabilojaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=ukulele+fingerpicking+songsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD614 18236 bytes
SHA-256: 1fd5320e70b67839aadceff67eccad92de2a7e33366b628beeac1c4347007e18
font_01_sfnt_off0000f219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF219 10596 bytes
SHA-256: 7231385fee9567b2c3ca030cc52c54b2ece4874c10c9436c25d3a89650590225
font_02_sfnt_off00010a59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A59 16364 bytes
SHA-256: 09840427c393ac41e2120d2d6fb68369a2f1547ee1a76e56d4f4b09198b264f2
font_03_sfnt_off000134d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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