Malicious PDF — malware analysis report

Static analysis result for SHA-256 36a421b9b7292487…

MALICIOUS

PDF

83.3 KB Created: 2021-06-25 12:03:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 46a9822d6321349c11e6be21e7fe9cca SHA-1: 27ad355206c033274d87993043a9c45ffa1877dc SHA-256: 36a421b9b7292487c4e13fd1c23b9d2538d6760ccf76db50b77a8a09c8a6b782
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, characteristic of a link farm used to distribute malware or conduct phishing. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content, likely leveraging embedded JavaScript or other PDF exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://geostudio.eu/userfiles/files/50825620793.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/1f4fb3f429ee1fa16307665c8e123c4c/80033862059.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16082aa709fbb9---juwenilelabewuwuxodi.pdf
    • http://karat-dobremiasto.pl/userfiles/file/44248778989.pdf
    • https://baxsporthorses.nl/userfiles/file/zumimusepugivowobox.pdf
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/45e0f48763f98344ddf2abb80ddc92bb/wulexovasafuxusu.pdf
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/namisolovixetaralo.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/68ijrldfvgialbkg79uvj4tclr/54495929102.pdf
    • http://ackerviewguesthouse.com/userfiles/file/juxamujowitonebasuzitowi.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed15f06cd7---78192884886.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63fd583009---55682056296.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/2ead5a297d223aa24695cbbd9a1bb52b/werugeganamedixawogig.pdf
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2b6f7072e---bupifumexizobowowizajop.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b390be8ff4b---43216739377.pdf
    • http://www.zaluziemalina.cz/userfiles/file/susorunitumavisam.pdf
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/bvkf7o0fc5q7lkb8i3r7mnv782/pixemivij.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a653cc8b5f1---mizitepaz.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=stardew+valley+snow+yams
    • 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_off0000e39d.bin
28f7bada56678098b8e4eff5cc897fb1bcac8e58b9a93f6d425f333a2affabd2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE39D 10660 bytes
font_01_sfnt_off0000fc12.bin
1d41bb96e899f650864e0bec6361123b9dccb5b5263ce2356c4c0a4415bb8269		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC12 17256 bytes
font_02_sfnt_off0001286a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1286A 16792 bytes

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