Malicious PDF — malware analysis report

Static analysis result for SHA-256 93043cd8cd4fb253…

MALICIOUS

PDF

93.0 KB Created: 2021-07-22 03:42:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 05145c80f8ee117f3368a53366242bd5 SHA-1: 8beb843ab37bbe185f50a996fff08c8d961e13b4 SHA-256: 93043cd8cd4fb25347b8bbcc0b7ce24a466901a2cafe8b3d4cfed071f18bec4c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many of which point to compromised WordPress sites, suggesting an attempt to lure users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://kvkumariajnkvv.org/singhania/downloads/file/63817490200.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ac306ea40---dalezudumolox.pdf
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825b59e0cfc---selor.pdf
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/1257bb47a73b852b571f5f80a57869fe/rasaxafunolobo.pdf
    • http://cdmvt.cz/sites/default/files/34337360483.pdf
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/bkumij2nsuim53vkblp4j7q3dl/vusibamavekizixes.pdf
    • https://ncvpte.in/userfiles/file/40516479071.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c79130111---fegutudexusopitivebon.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/bec6875ae3c32ccd570b641d01d0b412/38806719004.pdf
    • http://atut-biuro.com/uploaded/file/3924049519.pdf
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/438b1bed199acc6bef87d75a0212be60/39679806019.pdf
    • http://argol-editions.fr/userfiles/file/diraxajeberur.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/7j32dhklt95lp9v2vj1e5d43nl/50930799672.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ccae0c898---53322067123.pdf
    • http://www.jindatunnel.com/up_files/file/wabeferev.pdf
    • http://longhornrings.com/clients/0/08/08da48574b41509ac7bedcf2500dc652/File/xaputaravedikanere.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080461766eb7---mivolug.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b65b9797887---32274494927.pdf
    • http://nguyenthaotech.com/upload/files/92736054802.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160846d830094b---70738790305.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c37218c8d---88183776501.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160900e9995a34---zijazuzegefotofesovofab.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/vrnudltcn8p4r2ua6pptc3m07i/ledixinezatobaw.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16077673b9b210---bufuzojom.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=letter+of+intent+for+nursing+school+example
    • 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_off00010769.bin
4b488ad2994950d116a2ab85f0f1179599c07b405a9ecefdd2419033cef42b6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10769 16844 bytes
font_01_sfnt_off00013347.bin
ac4d26e8cf98c33b814265740a37052406eb3399c6a642dccdcdc6b3dbc41b22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13347 11088 bytes
font_02_sfnt_off00014cf6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14CF6 16792 bytes

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