Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bae00e4a01cc237…

MALICIOUS

PDF

126.2 KB Created: 2021-08-16 12:27:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 80279d4dbde1e0786695670741bd491e SHA-1: ce494ddabf267db41a6403663e709171bd89409f SHA-256: 7bae00e4a01cc237b1cf6a144375af4c8ed8b0f22dfc13b2f7ebde2482a11e5d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links pointing to various websites, many of which appear to be compromised CMS uploads. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded URLs and the structure suggest a link farm designed to redirect users to malicious content, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9882

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/d99ff53dcdd5849deb732e385cc31ce7/6131077969.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c89eace8f88---zupubaxutiwamuve.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085ed99a2331---68625146178.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df02c5eb32b---46154978940.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160f0e8cf9c573---jukopujig.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607116695847b---werasutuf.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b03f12eb156---51073048024.pdf
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/4b1333aeee59e3fd6a2fe6668a4d4191/62410514015.pdf
    • http://celiapopememorial.com/clients/4/45/45605e685ba8a3b32f56966823665796/File/wibumodilakikezegozarugov.pdf
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/4ac89cc20112f623aa4e9d089af2e6ca/zimizam.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d5d24168a64---84508508235.pdf
    • http://edanieltour.com/FileData/ckfinder/files/20210604_2D4E475FAE3D8494.pdf
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/65cb387978a087fc8fe5b3709e6ae490/susagebajopuva.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b12f633c192---14234423261.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/563de90735f4ff0c8decdcff29a9bc46/xanobujigutopuzoniba.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5adde234eb---51771586485.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cb191d85632---68408887900.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/nsq62uedsov9d2vshnh4dlv0aj/58683321369.pdf
    • http://clinicaveterinariacene.com/userfiles/files/42866511453.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3cf34dfa4d---faduwilo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=radio+ht+kenwood+th+22at+manual
    • https://lapdonline.org/file/72875832407.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000170c2.bin
b7c5a8e4059ef4add8d48a335fb96fcabee90c324efe1680135c5d4831d784e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x170C2 24980 bytes
font_01_sfnt_off0001ad27.bin
06be44ede7823c8cf2ffb6be88b371aad3302bf5fd5ebb9d233378772c3135f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD27 2920 bytes
font_02_sfnt_off0001b92f.bin
ce2d850cd7bebca469efdf3f73047f63b792c2ed05a4659d126083e3da211777		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B92F 10688 bytes
font_03_sfnt_off0001d192.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D192 16792 bytes

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