Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cbf6b3b7323adca…

MALICIOUS

PDF

85.7 KB Created: 2021-08-09 10:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 939f7cb22e16395ce192a17c69864123 SHA-1: 9adc054b71826609e9419c3ac24242e5fe832cf2 SHA-256: 4cbf6b3b7323adca67b37124e5ec0d606063a5eeca52385b2576af50e1ff64cc
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to websites that appear to be part of a link farm, with some hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary function observed is to redirect users through a network of potentially malicious or compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://chiangmaicharmingtravel.com/ckfinder/userfiles/files/31230185570.pdf In PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/84cf188fcb488727480bf9265164abb6/raparutikeleloxivixe.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/14440048507.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/69764176030.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/zukudajuv.pdfIn PDF document text
    • http://imoroz.by/upload/file/87440531300.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/pivutubekufama.pdfIn PDF document text
    • https://twfern.org/upload/ckfinder_temp/files/20210530052324.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/65546106141.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16082a157cb61b---ripuzuwawamu.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd2c03b760---7290755814.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073de284bc73---dazozadoravud.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/f7a089721ec3af39fbf0f607baeb79ae/96394084239.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/33289707984.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/d55fb138b224ce8bc33ca3e4870fac1a/72372060323.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/88968545304.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/92771014636.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc1a125272---18622289147.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/ruzirosamarizirasamakusab.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/f161a037ea43f9f4488ccabf68cc439c/kasoxivofijif.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/16808499021.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc775eeb91---wogemubuxaxa.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/pubarufonilezixonis.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074471c5e180---3076704387.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=carrom+pool+hack+apk+download+androidPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/59171750875.pdfIn PDF document text
    • 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_off0000ee71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE71 16344 bytes
SHA-256: 2de974b9ae0ac353dd9ec780b3ffcb3028888ffb78b93a26d4253380c1222e44
font_01_sfnt_off000118da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130F1 10592 bytes
SHA-256: edfe939a05e669dfb89a54f4815a0cfd661e44a06ed4159273c0422301078966

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