Malicious PDF — malware analysis report

Static analysis result for SHA-256 74d503b3bbb9c0cb…

MALICIOUS

PDF

92.4 KB Created: 2021-06-26 01:53:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ab9650efd31345ff242462c49a8d7976 SHA-1: 0cfa216daa187ffe6e7589af9cca09102feb9f61 SHA-256: 74d503b3bbb9c0cb70fb33de52d0b91a3d79f31de44e619f4a363f449a815782
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations. This behavior is indicative of a phishing or malicious redirection scheme, likely intended to lead the user to a malicious payload or exploit. The ClamAV detection and ML classifier further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c195ede7d---jedubafulelodimeb.pdf
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/da48bf0f4e7c4572ff5d5a34b5c8be59/12117428301.pdf
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160ad53f2a7563---bexakodesulugud.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c886238f081---63204406429.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e3ef8255e---nizexanakelifu.pdf
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/39fa2c6483f70833af0338e196ed5b47/68787326552.pdf
    • https://ccskin.com/geektic/files/pakativad.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/dde0c5f543a1da7177271fcc874646d0/46167710497.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d91911e9ab---rudememudaw.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af66e3a7ab9---buguwuzuxodipa.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a451ecc84cb---48433288744.pdf
    • https://aquafilling.com/userfiles/file/75359450805.pdf
    • https://coffeetuanvang.com/Images_upload/files/leponewefi.pdf
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/2d01d38686efa3fa38b58cbc3c66474a/pixelomutaxeto.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16080c37962330---72929751734.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607027940114f---powepozomuvisaxovi.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160865043362d1---lixemamifetid.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c882a976113---95809738798.pdf
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/ffb6a50840bb19b1bddc914518d7845a/18113778487.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a8951d9ffe7ec1afdcec4db5c88c1cea/72067689156.pdf
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/fe4672ff3a7103c5aaa8df3b9a483585/52274080094.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/029d5d903e84d68602549cf14ec34cce/zukite.pdf
    • http://suttonoakfarms.com/clients/880813/File/moputazidamedobu.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1ef8317c4---xaxijujex.pdf
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/kesug.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=infectious+mononucleosis+differential+diagnosis
    • 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_off00010451.bin
bd2ed0dd7c565433a72ba8ef4d9beeb85bd793fec0ac086382758809abe2a795		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10451 17748 bytes
font_01_sfnt_off000132e5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x132E5 16792 bytes
font_02_sfnt_off00014afc.bin
86c5aaf82940bf5ef216f406729a2fdc6f617ffe5d7f4806d874b0c0d524ebbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14AFC 10872 bytes

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