Malicious PDF — malware analysis report

Static analysis result for SHA-256 414fa023f663fb69…

MALICIOUS

PDF

77.2 KB Created: 2021-07-28 00:35:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b6d610281545069fa5c0d9524f8a816a SHA-1: c83a195bc5783df7567e664d83e33fa3fe649859 SHA-256: 414fa023f663fb69e7255d7648c6a7d73b72ca1206800113dfb2465b281f2c84
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple unknown URLs hosted on compromised WordPress sites reinforces the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160853f629c1f4---69309445671.pdf
    • https://tectrongim.com/uploads/files/4609162977.pdf
    • http://casaatlantida.com/userfiles/file///xesakakol.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/f91eb17a8de10b340aae498fd12b55a6/wigudo.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc0ba0bffd---gefub.pdf
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/m1aclf7a2mmf8sesa77o2mf1v5/zifejotezesuputinej.pdf
    • https://sindonis.com/userfiles/file/juzof.pdf
    • https://larrialdiak.es/files/galeria/files/85164522579.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6a4478060---zederejamiz.pdf
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1626121596.pdf
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/405982222bf5ab8701d8f988b72b550c/fovabefov.pdf
    • http://cdwy028.com/uploadfile/file/20210618133450.pdf
    • http://mastera-mix.ru/ckfinder/userfiles/files/sivusuxazanuzojimimavam.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/0afa91b3216770b2ef77b7390339a0fd/bipimi.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/d1cbaa721db987decfb9c068fe9579c5/jazunomujelejedabup.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/attje5dqaoeb4tshsr7mjgs650/xutijulizirojodugifuwim.pdf
    • https://vkgnassociates.com/dayafter/uploadimages/newsimages/file/tapes.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/rmhcdavute1litqq37335otnv2/bomupufotoworigo.pdf
    • https://parklanehotel.asia/userfiles/file/10810187068.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608311b9086e7---87796848350.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd38440c25---98761222591.pdf
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/mirobalufat.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/299490dcf121162c350525cfdf9af797/39904352711.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/87omdn84gaennnag2rsctandfr/pidoxigijusanavonon.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a16952171a8---fuxovilitajoxot.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+much+are+305+cigarettes+at+publix
    • 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_off0000c8d2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D2 16792 bytes
font_01_sfnt_off0000e0e4.bin
9c66ce421fdcb456bc38b69f96bf7d996c8a306f1d941a52f0e39369fc8a3a47
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E4 16168 bytes
font_02_sfnt_off00010aef.bin
0cf414c5d698aa51d1694e6b8c65a6eb1b42c9658ddc2b1907ecb8f529c2ff80
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEF 11564 bytes