Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c71d6041f76741f…

MALICIOUS

PDF

92.1 KB Created: 2021-06-28 07:14:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d86f20d03103ca7254db7338fa32d9a4 SHA-1: f397ec56dde4782cd2f6eb20887f3ff685e4169a SHA-256: 4c71d6041f76741fe9ede27aa4fa114327d52b624c2799647de6b18e282da16c
164 Risk Score

Malware Insights

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

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, directing users to multiple external websites, some of which are hosted on compromised CMS platforms. The presence of numerous links and the use of disposable hosting suggest an attempt to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609831a7ecdab---59181241255.pdf
    • http://mygiftltd.com/userfiles/file/93333379769.pdf
    • http://abnicum.com/files/file/80445077846.pdf
    • http://xaydungphongphu.com/uploads/files/50787248291.pdf
    • http://tremonttemplemacon.com/clients/862779/File/38736718125.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/r55tbrh23vdo0k237fo64hgasa/bitodetasafexelemig.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160842c58939f3---gusinevetanarej.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/63679b492386752478cca62e7559b045/zugizawodov.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7099aaf74---fonufepo.pdf
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/2e4ae8340d6ae0206487a820e14013d2/71398274766.pdf
    • http://www.jindatunnel.com/up_files/file/pogukewoputijisi.pdf
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/2fe521091570d15b3b31bcda6db70fe2/47967005997.pdf
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/5db35da6175fbee49a8903c32e63250c/rawitazetoviporelo.pdf
    • https://giolog.biz/images/bulk_images/files/53782177035.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b179d96955b---65795522108.pdf
    • http://clinivetmadonnadirosa.eu/userfiles/files/zadaribolazijivedumetub.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bb717f65c12---38228288722.pdf
    • http://nutronicltd.com/userfiles/file/8357955599.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ac4d3d01e---58310025583.pdf
    • https://ceccarbotosani.ro/userfiles/file/bexidagibidugaxomixi.pdf
    • https://prokoncept.hu/admin/blogfck/image/file/31902902038.pdf
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/vujutagijidebiximuni.pdf
    • http://phuwangnam.com/user_file/file/vifuvuligonijisak.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/8ql30t19clikna07chc2hj3scj/fugagixuxijejomegekabuta.pdf
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/2dd17fbf175da60ccfed7ad23c2d619d/78195436165.pdf
    • http://beergolfers.com/blog/images/file/19763408900.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=squaw+valley+prices
    • 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_off0001037d.bin
0f160a36ae69199b47d1687db9d7a08bab62777941c4051915ad89edd56ca31f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1037D 17936 bytes
font_01_sfnt_off000132ad.bin
bb49832893a794499f8740077c0541f54a9ed32b621b27df566bc850ebb4e4b5
pdf-font-stream PDF embedded font (sfnt) at offset 0x132AD 10632 bytes
font_02_sfnt_off00014b2c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14B2C 16792 bytes