Malicious PDF — malware analysis report

Static analysis result for SHA-256 276b6386da6752f0…

MALICIOUS

PDF

77.2 KB Created: 2021-07-20 00:04:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 16f0bd8106bd55ede62659b2b5e654c0 SHA-1: 2182bea3a63e3c65ca4fba9055deb493bd067c4a SHA-256: 276b6386da6752f0693e9c8982eb4a35693fe468fdba9fd5523e3ca6b82d2f6e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to exploit users via malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f514421386---10501603704.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077309897fbf---64006855728.pdf
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/zejikileregude.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160ae26998b7a2---65324648503.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/42df0e114ff03df015426ef69ef68479/26466152867.pdf
    • http://smartvoicecom.com/userfiles/dadobovozipusa.pdf
    • http://s-moonlight.com/CKEdit/upload/files/vesujuku.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160755d8fd3783---33368652169.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0feff3279---sefanukib.pdf
    • http://stavebnevyrobky.sk/www/upload/files/nasizu.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160793a49635b8---29609812794.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/2e0e5ae09e9433523379ce9311c216b8/535153934.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e54077ebb3c---20551267353.pdf
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/3ffd5a04c2d3a7d5c47f4e0578573d10/fuzosavatojekapu.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/0876111327dcbb38dce4b90804d798c1/xeriwuwi.pdf
    • http://beming.com/ressource/site-image/files/60171647253.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0dpg7gcf5dkdqdmi2vqj2dftf5/kosolikubaji.pdf
    • https://southwestlooms.com/admin/userfiles/files/9136136382.pdf
    • http://drive4smilesontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/fanaja.pdf
    • http://krugernilssonreunion.org/clients/c/c3/c301050bdfa85653d7453904791897ac/File/35235730542.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f417d5261b6---larefefesipow.pdf
    • http://studiolegalezullo.eu/userfiles/files/35261740874.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607378d1630fc---52502929751.pdf
    • http://maynenkhiinverter.com/media/ftp/file/rujexom.pdf
    • https://kidneystonetreatment.in/userfiles/files/41930712784.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dde384d353---patibepolepodabovo.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac9bfdcc8b---20721729754.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=given+focus+and+directrix+find+equation
    • 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_off0000cb98.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB98 16792 bytes
font_01_sfnt_off0000e3aa.bin
2ad031eaa2270805403f519bad7de92ba60c4b174b626dddf1a76eedbf9867e3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AA 16288 bytes
font_02_sfnt_off00010e37.bin
278c5e5433966be82858e69845dc9f6e76efba9a6d3f533e4af25f0841728297
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E37 10876 bytes