Malicious PDF — malware analysis report

Static analysis result for SHA-256 78b283baa2e18fdf…

MALICIOUS

PDF

73.3 KB Created: 2021-07-18 17:23:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2edc3a88576e55a91039cfc88a9a24d8 SHA-1: 532d852af2188f5da1b21fc5ed4a6de07705eabf SHA-256: 78b283baa2e18fdf1a7909e6b4e2182d003a389781ffb3e8661cc6be2913211a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of external URIs and link farms points towards an attempt to lead the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://dinskayarealty.ru/media/file/kafulutewozaforimu.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/gouhpmp8akkoabr5el9jfvg30c/xotadewevorimitobezive.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/504431f5f4e21be788bcce517c72f158/87003049031.pdf
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/438e090629bd8890a09414fba56cd2a1/juwuniletibakuzavevirap.pdf
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/43116353841.pdf
    • http://tragiaocolamsapa.com/userfiles/image/file/89632010839.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763855f2c0a---leruwemikekijon.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b5cbdf5ba4e---didafopoxodesosimo.pdf
    • http://mdsalon.ru/img/lib/file/zorakulebu.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a84a826192b---geruwaratukopowobamadofox.pdf
    • https://poolpoint.be/uploads/file/19766794163.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3453b57f8---95840348838.pdf
    • http://gsemilia.it/userfiles/files/40642162655.pdf
    • http://centronegozi.com/public/kemig.pdf
    • https://epiphanych.com/images/file/96865891962.pdf
    • http://vngo-cc.vn/cooker/public/files/duseduwamonaw.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/096afdb56bfb51fb916fd7ff4119a565/duwugajugujopokopari.pdf
    • https://thietbidiensino.vn/media/ftp/file/fogipobemivowido.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4cdcc6dda5---novevux.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da6e4bc148---1112913160.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b330cf2a039---81407607331.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5279abb89---mimuduxomurolipenujap.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a68bdeb3f27---28485465214.pdf
    • http://allnatureint.com/userfiles/file/favenijidifakuraf.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=the+demand+curve+for+a+product+might+shift+as+the+result+of+a+change+in
    • 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_off0000bd2f.bin
4849a3a4d2588b0cc8dc0636dd0c34c98ae06aa62c61417eeb7f7737ac01b6e4
pdf-font-stream PDF embedded font (sfnt) at offset 0xBD2F 11196 bytes
font_01_sfnt_off0000d6fc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FC 16792 bytes
font_02_sfnt_off0000ef0e.bin
037c8bb6389bb5255badef2bda34447c8098f21723971d17a227bfa209ac1627
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0E 15484 bytes