Malicious PDF — malware analysis report

Static analysis result for SHA-256 483d2aea736b5f13…

MALICIOUS

PDF

90.2 KB Created: 2021-07-03 12:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 19ca639a2ce8af6f63d02bb5b1b02225 SHA-1: c15bdf690dfc6ebe24bfe327637f140e1927fac5 SHA-256: 483d2aea736b5f1382c80bd2571d17a1659dc8785d3728eb8f66b8762c2cc280
156 Risk Score

Malware Insights

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

The file is a PDF containing numerous links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing. The document body is unreadable, but the heuristics and URLs suggest a phishing lure or a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160af16cd102af---jutisikufipatil.pdf
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/bc822046a7a7dccd3912fde79551ab51/sigawixukazezak.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087db16e5d1d---tubuginopawalol.pdf
    • http://kozszemle.hu/uploads/files/foxul.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160aec1563a4f9---tumitixapupi.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825b3d476d8---16493325249.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/r77rg41qqub1akdd1ivt836d82/topol.pdf
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/1d116c8f9021133fd4886910c268f3de/68375447703.pdf
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/o1d7dtbelp67bfro6a5iipa2t3/kosimen.pdf
    • http://champaigncursillo.com/userfiles/file/wapafeg.pdf
    • http://dansecyr.ca/pdf/file/39792095615.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16096f8eb32ec5---fapegofemugerakeguta.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160814ff75e5f9---12631384423.pdf
    • http://ctyrkolky-gamax.cz/data/dokumenty/69569495026.pdf
    • http://timandlor.com/userfiles/file/71891252303.pdf
    • http://sochisushi.nl/survey/userfiles/files/57736666178.pdf
    • http://qazaqbanki.kz/data/content/files/kazoririmover.pdf
    • http://vytvarnyobchod.cz/UserFiles/File/13005762612.pdf
    • http://omonetach.pl/foto/ilustracje/file/zofuxinewafemixifo.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/ce9d366e54255325b04f5d051d7bf177/kifokawetubatedosu.pdf
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/fomanovugudopo.pdf
    • http://bakoca.hu/files/file/vovumudewatikepegam.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/0db1dc7edab6f120d243c2c2442b15f1/xobiji.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4c2ad1632---24022828195.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da569a31d6b---kerokizoj.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=types+of+visual+text
    • 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_off0000feae.bin
f01d6dd2077ceee250e1976fee9e91aaaed58ac1af5ca29b765d652eeb58d413
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAE 10492 bytes
font_01_sfnt_off000116c8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x116C8 16792 bytes
font_02_sfnt_off00012eda.bin
5982562f209f3dec6e79c28e0142693e4f0929968e1d15b43a25db3a702d87cf
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EDA 17460 bytes