Malicious PDF — malware analysis report

Static analysis result for SHA-256 611500acba172627…

MALICIOUS

PDF

92.4 KB Created: 2021-06-26 03:06:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5a1650f8acdda52d752415053c629ee2 SHA-1: 6d0a0342e9573819d24d1370c435bd08062a51dc SHA-256: 611500acba172627b898f97100f00849adff58388d89ec647a69278b14b83aa2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the embedded URLs and the 'link farm' heuristics point towards a malicious document, potentially leveraging embedded JavaScript for redirection or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://wastran.ru/uplcv?utm_term=imago+therapy+worksheets+pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c902b70204---bifotiwewobomejinesowola.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707645c51ff---xabimalofosin.pdf
    • http://www.irrv.org/uploads/files/xevowijaxaluweximebiza.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/6f0c1f01cbef519db24ee6a5253e8b12/zudemudoduxop.pdf
    • http://laduses.nl/image/file/vefevirexofadasiwe.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cce8b106e2---99978613386.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607804dc7b25c---dojodidopogewolufu.pdf
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/0d05a93ace1fc639f99aa0ce0dc15178/dixajebisulazinewuvefom.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ed8bf0142---lekasexot.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e6af56a8e---61811309937.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160909d6fab43e---pitisevadogefegagaken.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/575aa3a54dc5625086c30c4c20ef7c7e/rizebipabigipileji.pdf
    • http://lpkgoodframeupvc.com/userfiles/files/risofe.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/37lts7cf2ppoh8h8l09ohiieuf/5044159233.pdf
    • http://darec.sk/files/files/94974718014.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/bbf5d5494428c5b8ac853a9a38853a06/71798120131.pdf
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609d33bd10c37---60127457114.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ccc7323a647---xinuduvazipukugesaxixova.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/e06dce06b796491e91d38145e6648133/xosusaxuru.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607788ac66b3f---jupinexuk.pdf
    • https://floridainvestment.cz/files/file/42747444855.pdf
    • http://bigxra.com/uploadfile/file/2021051110453273499.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/7cab40daddd3932eb325ad34060dd47f/89013706160.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_off0001035f.bin
b959715db49a1a929ef23e04395c9d4fc75cea903c17f6634c30086a1d3a50f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1035F 10948 bytes
font_01_sfnt_off00011cab.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAB 16792 bytes
font_02_sfnt_off000134bd.bin
11ca1321c0871b148ff83492d9dd4859c6544cd2dcade3995f932da3f14251b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x134BD 17752 bytes

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