Malicious PDF — malware analysis report

Static analysis result for SHA-256 350b538390b44753…

MALICIOUS

PDF

106.1 KB Created: 2021-07-09 05:23:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ba36ddc554fa6ba7b7c9467eac57ad44 SHA-1: 738cd3597e54937b1cab30cd0648d256845e8d1e SHA-256: 350b538390b44753ce6b85897dd99d73fcb0da7d66a8923c622f7acad2fb1cb8
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous external URLs, many of which are hosted on compromised WordPress sites or disposable domains. The ML classifier also flagged this PDF as malicious. The primary function appears to be directing users to external resources, potentially for SEO spam or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9308

Heuristics 5

  • 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://technoculture.cz/admin/upload/file/tumexabutajani.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/vbbo3smq0mjm3n6s77aqg8v0it/zidunegejugusozomo.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/6de38b9172b62f47c94b5710ef279f3e/muxawukexikawolez.pdf
    • https://bookatowncar.com/userfiles/file/jitababebuta.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098a9ee15120---44070286843.pdf
    • http://daearesort.com/FileData/ckfinder/files/20210706_3BA088D7CF5C5CB5.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777f705230d---walogumukubosefoviwit.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7d409c4e9---84104131803.pdf
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/46f530ae17a2d74d8d4fbb83e61df6cc/11998484863.pdf
    • http://teplo76.ru/uploads/file/17525858058.pdf
    • http://symbioticlifetech.org/attfile/fckimg/file///2021070218957_918501442.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160de39f9dfa23---67742355987.pdf
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f737024d9---josure.pdf
    • http://legendtec-eg.com/wp-content/plugins/super-forms/uploads/php/files/e6qhocjc39s0p7t2p9fmbb2v22/kifutenedene.pdf
    • https://bibliothequeanglaise.org/upload/files/lirojuxodipaj.pdf
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/a8ff4806a719f68f6c025d7243f0b545/tagagijizuxapapawenebiko.pdf
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/3aaebac1b6faee672d07d2bdcd9ccbc9/44152586861.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce76d8a71a---86348517831.pdf
    • http://olneyjune65.com/clients/d/dc/dcef5d22f85ec69f5810ba62c2e8cf46/File/44750636977.pdf
    • http://canevinclassof70.com/clients/6/6b/6b8b8ee0d314e59372afbcb75100d768/File/zosoxatobutor.pdf
    • http://begemot-rus.com/uploadfiles/file/2021050302505973499.pdf
    • http://lyzebrno.cz/userfiles/file/78909011653.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607169b1101a0---salulamigamelatuzafid.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160829bc447af9---morilegiwonad.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc9f04eed0---37883241876.pdf
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/4thtdoknmogqef6tcqvt179p4no066kc/59399855599.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=passion+flower+life+cycle
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001177d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1177D 16792 bytes
font_01_sfnt_off00012f8e.bin
114ac5e184e80378cbd008726cf5595b69ac241c399e0597e0ff171760d0a508		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F8E 16604 bytes
font_02_sfnt_off000146db.bin
ddebed293c45c502d79d6589a4bf802a5813c5e2b7843a5f77e5b7765897694b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x146DB 2128 bytes
font_03_sfnt_off00015030.bin
c8d9c373d00155d35b62b01f6d73a0af17e5b925b7abcd3c8294a543d6d79993		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15030 10432 bytes
font_04_sfnt_off00016805.bin
e81c3decab3d7c444f72fcc915c7338685efbc47e92b28c8f0e9966bb65111ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16805 19340 bytes

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