Malicious PDF — malware analysis report

Static analysis result for SHA-256 141606a30bc17dbd…

MALICIOUS

PDF

82.7 KB Created: 2021-10-04 18:46:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0f827a53d23b39262d739ad1db5630ed SHA-1: b898272b21c20e1575cd90875dacc2392d72b663 SHA-256: 141606a30bc17dbd980c12111e97cc367242517caeb4ee8310236810860ad239
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm or SEO manipulation tactic. The presence of these links suggests an attempt to direct users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615a9bbce2599---39531597943.pdf
    • http://tacchigroup.com/public/thread/risorse/file/21904099530.pdf
    • http://at2apigroup3.com/contents/files/damukanibonepadobi.pdf
    • http://bunny888.com/ckfinder/userfiles/files/76405305621.pdf
    • https://daks-96.com/f/uploads/files/94074928047.pdf
    • http://www.icf-plant.com/files/file/3520040652.pdf
    • http://perfect-gallery.com/userfiles/file/bazoponoji.pdf
    • http://ayurvedicclinic.org/userfiles/file/voterexariparevejixelikip.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/4c684da56ef3c3bad507c44eb6586b14/73279735050.pdf
    • https://sanruouvang.net/images/uploaded/file/feduwivibuwokadigagexazuv.pdf
    • http://online-cycling.com/files/file/danexugizejunolejizuvekip.pdf
    • https://100tmt.com/uploadimage/files/20210922164328.pdf
    • https://wittnebel.dk/file/33751674701.pdf
    • http://dpsszczytno.pl/photo/file/2153530271.pdf
    • https://learn-atdi.com/uploads/files/nujikivepezimi.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/22f79ee7575d4cb6b83d77afa8840fb1/49871070282.pdf
    • http://tianfonmm.com/d/files/betixofufafatilawageju.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613672f9c6824---tofiripiwovavebot.pdf
    • https://bachson.net/upload/file/87452737431.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150d020d2997---samamixuxaz.pdf
    • http://heydarbaba.org/resimler/files/22921008238.pdf
    • https://cuisinescartier.ca/upload/editor/file/wovuzowikidipunejokexu.pdf
    • https://sibconsulting.com/contents/files/paxawo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=raymond+williams+base+and+superstructure+in+marxist+cultural+theory+pdf
    • 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_off0000d963.bin
e2762ed0510bb88950e2faf857a6d9cdacd3da7425ff0e3f7e698a05bac15796
pdf-font-stream PDF embedded font (sfnt) at offset 0xD963 11472 bytes
font_01_sfnt_off0000f42d.bin
1925bf319a9eb80e976f482cdf1f0331774256904c632de74e99583c3ab96220
pdf-font-stream PDF embedded font (sfnt) at offset 0xF42D 18724 bytes
font_02_sfnt_off00012429.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12429 16792 bytes