Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c42c86d0a1521a5…

MALICIOUS

PDF

81.8 KB Created: 2021-09-10 22:14:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f52482e1c41ebd42b8449df9b5d54daa SHA-1: 318a48fb1544f72f7d2707448ab09630c3256ac3 SHA-256: 5c42c86d0a1521a50ab05c0e64576493c85b5011a0c04cb8f16d5997c94700d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it functions as a link farm pointing to compromised websites. The embedded URLs, particularly those related to 'hack free fire mod apk', suggest a lure for potentially malicious content. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/di2m188i0kb0dd4fislr64uj82/rififuruzobuluguvegiveja.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613726523704e---bebixawolilevotovu.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/muwiwujipomuravexupalonud.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/fenisojafatidorep.pdfIn PDF document text
    • http://exms.fr/sites/default/files/file/87117591468.pdfIn PDF document text
    • http://quetthe.com/upload/files/kapuvamuvofufokufevuta.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/visorexojebisop.pdfIn PDF document text
    • http://realcomfort.ru/content/upload/file/40789445313.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/65446866113.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/48599008991.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/18838633482.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613435e407697---rezefapekosizogujulo.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/bolirijimuver.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/gufunolenap.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/65094378639.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/jomerarasu.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff07f2e75c---gumasipazupajinuwabuw.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/vojufunixukafufefiniguvup.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/28031178510.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/58c2c5e5ffd57ae5a27e709e7b8f2293/kosen.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/44771820691.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/53136142099.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/6952770464.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/duvesumajetokefakoxivup.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/vajoxojafagojavi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=hack+free+fire+mod+apk+unlimited+diamondsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD972 10964 bytes
SHA-256: 910332b21bf0533d59168eb9f8cea143de38f6c874dd66f0ece2f9856781fd26
font_01_sfnt_off0000f2d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D7 17692 bytes
SHA-256: 612ec48d3e9a0cf3faacd24548b6022a28b173aac9c8bc2353570a2f811ac3ea
font_02_sfnt_off00012148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12148 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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