Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6b9744cc6160790…

MALICIOUS

PDF

90.4 KB Created: 2021-07-04 04:37:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ea6af8096a17007d0642654ca2dffbb9 SHA-1: 666734b2d44badf54f71baf153a68c9195a274b4 SHA-256: c6b9744cc6160790d01d566579a86b2c7c1a2f86cfcd6bef1662af83763553a6
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites. These links likely lead to phishing pages or further malware downloads, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://philabc.ru/uplcv?utm_term=20+elements+in+chemistry
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/2bb96e39ca45e4cb16f84aa627aa5e97/bemako.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a09c5b39b---82517662870.pdf
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/d2d3868e31e979a4b2f7bb2bb45d37fb/kobesobujefuvarumiwasudup.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac25a5e94aa---77312772292.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/i9scmmvfv6etd6tmu2gsqbhida/guderuteni.pdf
    • https://silga.ca/userfiles/file/xupitodutadus.pdf
    • https://beautyyaurient.com/editor_upload/file/47789418448.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/eb886729993fce02c357556e9160c4bb/47767446828.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/db60c4503b3ba729c6e4ce36abe4f1b4/15407368322.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160df80b6c4173---3990147888.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609c105de3dce---78637660166.pdf
    • http://vonkoenigsmund.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3ec8cdca9---finonolerid.pdf
    • http://hitecds.com/userfiles/file/kekupilajizisuxi.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f4bc7f689---zulosepetewo.pdf
    • http://dlikefulproductions.com/clients/875850/File/dusurifigabuxuruv.pdf
    • https://baobihungphu.com/media/ftp/file/63515962762.pdf
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/eipj45gc7gbn7v7pevhfrlhgi1/wejipapelul.pdf
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/455e0ca21fde27970e5a730b226d4aec/wiforuwixafeb.pdf
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/949c06074cd6f28e85da4f46630b7475/73078650619.pdf
    • http://alpha-th.com/userfiles/file/90612123586.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608832051e3a7---lepapiwivexakipixewesag.pdf
    • https://bouveau-consulting.com/userfiles/file/24989112583.pdf
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/e495ccf88a461665033d6a5a44f2939c/suvodebebajafane.pdf
    • https://aartipalette.com/userfiles/file/63017984224.pdf
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/vetop.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd25.bin
b65c6c9f9740eb542f2075ba9506858ce9c5fa78718ddc2a44eff726e274facc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD25 18372 bytes
font_01_sfnt_off00012cbb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12CBB 16792 bytes
font_02_sfnt_off000144d2.bin
66f447a9d836f52c5a1c2a1e3dea5373bbe1f1f2452149f49dbd4f699d2c0449		 pdf-font-stream PDF embedded font (sfnt) at offset 0x144D2 10472 bytes

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