Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e7f4d6f8400b3a1…

MALICIOUS

PDF

84.9 KB Created: 2021-06-25 22:09:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 68ebecffbc98f26bb39b1997cd510581 SHA-1: 972611a197a112e36fb33e92da7d59746afa2ae4 SHA-256: 8e7f4d6f8400b3a14bac2870176159d4230d756ba5fba7d3bdf85ef824365891
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and potentially malicious files, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://zlatartopalovic.rs//files/49424097939.pdf
    • https://abugfreemind.com/userfiles/file/23025018364.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084fc3b7aeba---nefidedapoxunima.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f858fbfb43---84640794514.pdf
    • http://quick-thailand.com/images/uploads/file/vuvivubukapawaponixazifed.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f40d4c69e7c895884c74f1554793610d/54745652806.pdf
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/3c23461b72689ea3abb58971672e8473/29925207389.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608337718e685---bukanupawul.pdf
    • http://msinziniering.com/userfiles/file/taxasowobazizopexev.pdf
    • http://verduciautodemolizioni.it/userfiles/file/9163321790.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609895c4bb0f8---suropipuwamitegifulujukom.pdf
    • http://donateagift.eu/userfiles/file/13229026752.pdf
    • http://wittlich-luexem.de/userfiles/file/89549107597.pdf
    • http://osrclass1967.com/clients/8/84/84e84eb3bb32f45446e669e24fea3ebc/File/94867208455.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ej20kjqjeq4dje1k40fsc8amur/ziwoz.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1607444d7efc9e---sepafadosam.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/ellt84bah6sg4ui2pqui8brhe5/31457356450.pdf
    • https://ludifrance.fr/userfiles/file/36878247565.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/d384715f4bac1aefe9b8c73977a2ccdc/xenogasuzivukama.pdf
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/pibpkjtrp0a04evl28jlie4hl5/14934939457.pdf
    • http://diplomat2014.ru/ckfinder/userfiles/files/82752985746.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7f35daa24---49420217367.pdf
    • http://kasargod.net/uploads/file/59061158358.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=round+calcifications+in+mammogram
    • 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_off0000e9f1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F1 16792 bytes
font_01_sfnt_off00010203.bin
c5228459d33496dcb2b31869f543e3ba3dd439143d184beca4d40d14d074bf36
pdf-font-stream PDF embedded font (sfnt) at offset 0x10203 16312 bytes
font_02_sfnt_off00012c29.bin
99de7b07426a8ff32e90bbcbaf590b165873698e5c0667b9f28d8fe55a0c16f0
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C29 10832 bytes