Malicious PDF — malware analysis report

Static analysis result for SHA-256 b313c5529a58aa7e…

MALICIOUS

PDF

97.6 KB Created: 2021-07-26 10:03:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6b9e4146e6187fbcaadc320aba2fb838 SHA-1: 82343cb697cc0f04df31e1c9f271c2486205bc40 SHA-256: b313c5529a58aa7e270943b213b6fb8ce00cb905347c1cca5b35af6714142072
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting. The primary purpose appears to be directing users to external resources, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/fc550a6lemlmpo8c07foj49i0h/27011974757.pdf
    • http://ahoba85.com/clients/2/26/26d353b61ac95a99d7df5001a3d58300/File/jebewewofonidabinikuvudi.pdf
    • http://lottfamilyreunion.com/clients/878857/File/28052022824.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8cb62405c---texajamo.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b41fd774b---nigogileb.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160ba399f1eb5b---logabumowimaja.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608adfadde378---jegagus.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfea3080704---sezipugenadedoja.pdf
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/961dfmdqd5or9rc8sf8sofk81c/laradudalu.pdf
    • http://cupta.org/userfiles/files/20210623174450.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0d30a8754---63553755815.pdf
    • http://ustunongel.com/image/files/34942532729.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dcaede603f---61872010243.pdf
    • http://agiusfuneraldirectors.com/files/file/39856318142.pdf
    • http://pivotal-technologies.com/userfiles/file/ligepuzazotagariwizilani.pdf
    • http://beveragesgs.com/userfiles/file/ruzepegufido.pdf
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/98893441784.pdf
    • http://unityproductions.com/upload/files/pipaluzojadimodu.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a2390c1c7---17482674445.pdf
    • https://angkalaris.com/contents//files/powofejumakopowujatasob.pdf
    • http://rexant.by/upload/editor/files/28785862937.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160780ed15df3b---21460193873.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/t1m1bbvob49vrlot9cilhof4p1/13976661447.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+use+panasonic+microwave+oven+for+pizza
    • 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_off00011b1f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1F 16792 bytes
font_01_sfnt_off00013331.bin
373bad276c10a26f8c975062658eeffafb856d7a566c822c31f8b9491190a8db
pdf-font-stream PDF embedded font (sfnt) at offset 0x13331 16724 bytes
font_02_sfnt_off00015ea2.bin
267e7a685f8fab89936f46728f441c6fddc16b7c7de43e2ed97aa189886c4d9a
pdf-font-stream PDF embedded font (sfnt) at offset 0x15EA2 10896 bytes