Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed3cb9e23122a947…

MALICIOUS

PDF

93.9 KB Created: 2021-08-24 04:42:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e62c42484e69082aedc3bf42f1500dda SHA-1: 61e0000b1356f6a7852ef7e6230b25274a4c0746 SHA-256: ed3cb9e23122a947873a85c6910bd5dc54f7693f5e482f1f56ebba3ff976f0b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites and other disposable hosting, likely intended to trick users into downloading further malicious content. No scripts were extracted, but the PDF structure and URL patterns suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://triptoboloyfoundation.org/editorsfiles/files/99044835592.pdf
    • https://kristinanamaste.eu/files/vuxawitekekejeketatakoni.pdf
    • http://dlmberatung.ch/userfiles/files/wojoburapakame.pdf
    • http://brlairport.com/images/file/zuropogitasujuvik.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/147037a1f705227de0291b7d8b19c239/90142460136.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/1f6567991d7de55159225a3aa47d6edb/nasukazosumasisesopenu.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6f64be499---84854606002.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b25e7a5ce1---97542976633.pdf
    • http://tajeer.co/userfiles/file/vexapuluke.pdf
    • http://vuonlan.vn/data/upload/files/juriz.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0108a13977---86889435446.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/mgnorj6ks51dgp4bed60tn4eti/jumunogefenibunadi.pdf
    • https://loctra.net/userfiles/file/lulikimewipiba.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/c48pim8t5ojjofm6j24pbpebc5/sapuxojesidewizi.pdf
    • http://criminisiepartners.it/userfiles/files/zekebagawa.pdf
    • http://harasim.cz/uploaded/files/17924947681.pdf
    • http://hotelgiottotorino.com/userfiles/files/44943071762.pdf
    • https://aodaixuan.vn/app/webroot/upload/image/files/lodivuzed.pdf
    • https://anna-bel.com/app/webroot/files/userfiles/files/jodugojaxiwabimiwojisas.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/bema698u4d53kd3hf24rmj3rsv/7922823196.pdf
    • http://gramercy-grand.ru/files/file/datonozisimemagimonubizo.pdf
    • http://araonline.hu/uploads/file/62692438469.pdf
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/17807734068.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9a7b37f1b865dece6327dbb2e8fe740e/labanika.pdf
    • http://cncforginghammer.com/d/files/59484920605.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c9150cbfdb0---999218172.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=primary+school+english+grammar+and+composition+free+pdf+download
    • http://janyska.home.pl/_mjanyska2013/fotki/file/62307646585.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_off000108a1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x108A1 16792 bytes
font_01_sfnt_off000120b8.bin
9b29849a4db0fd610cde960284d01c17deb3476c5c653e7dfafc50dcb5470cd4
pdf-font-stream PDF embedded font (sfnt) at offset 0x120B8 11268 bytes
font_02_sfnt_off00013ad6.bin
8dff28fa9ebd2eb7f1dbeeb635dbd422ce72b254d12e1c798d705bdde6f10506
pdf-font-stream PDF embedded font (sfnt) at offset 0x13AD6 17716 bytes