Malicious PDF — malware analysis report

Static analysis result for SHA-256 c38c9964e69b4d2a…

MALICIOUS

PDF

74.8 KB Created: 2021-09-27 16:31:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e0dd16c4fcfe57f7484c1eb1f5e9e579 SHA-1: 061108544410848c4e24c0d5c157b2102fc25847 SHA-256: c38c9964e69b4d2a2b3ea8a22cccdc1c26a478075c263b8f99b9b462d692d1aa
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. The presence of multiple links to compromised CMS upload directories suggests an attempt to host or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/7970efa169d24f6703a32221f51fd14f/97446443573.pdf
    • https://perfectprojects.ro/userfiles/file/sojubitilozawerufenutegi.pdf
    • http://bezagsecurity.cz/userfiles/96517370849.pdf
    • http://bjbtrh.com/files/pic/file/rerunajopasagidog.pdf
    • http://teplospectr.ru/images/files/41643701623.pdf
    • http://badaranquehablar.com/userfiles/files/savujubirapivokoberobefi.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b7b6de649b---33221108510.pdf
    • http://manenshop.com/upload/files/69918096681.pdf
    • http://leebyunghun.kr/new/upload/board/files/27088200477.pdf
    • https://lompatjauh.com/contents/files/57231188254.pdf
    • https://mmrh.myagenda.cz/pictures/editor/files/tomerigev.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161300eeee3b7e---28844154035.pdf
    • http://qazaqbanki.kz/data/content/files/zibumosu.pdf
    • https://melnikhouse.com/userfiles/file/zipobuzikes.pdf
    • http://auto4-spb.ru/public/images/ckfinder/files/kerukover.pdf
    • http://bouwbedrijfansing.nl/userfiles/file/moludemuroxamugelusex.pdf
    • http://konemara.hu/userfiles/file/xatifatef.pdf
    • https://shreenathtechnologies.com/userfiles/file/11685298038.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1614b1075d1506---jukepugoriv.pdf
    • https://capitalsyndic.com/userfiles/file/piwemaxeti.pdf
    • http://abwingsbuffalo.com/uploads/files/48486833190.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613d37da39f67---wuzukujotunevalozoligome.pdf
    • https://tectrongim.com/uploads/file/vusevevimazuxozobafa.pdf
    • http://chemtron-vostok.ru/media/file/77002593595.pdf
    • https://www.edm-medical.net/ckfinder/userfiles/files/fikububufewiruwagowapu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=android+games+modded+offline+apk
    • 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_off0000bc06.bin
ed413d5d397c1f7f2d57f3ee120cb26788a8695d6b91b0e08866dde86a6d9092
pdf-font-stream PDF embedded font (sfnt) at offset 0xBC06 18828 bytes
font_01_sfnt_off0000ec9b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9B 16792 bytes
font_02_sfnt_off000104b2.bin
a3b3e47b2efa79601d369ff195542b28f490aead80fa26b18524fe6df7fabeff
pdf-font-stream PDF embedded font (sfnt) at offset 0x104B2 10816 bytes