Malicious PDF — malware analysis report

Static analysis result for SHA-256 577d7319aca14dba…

MALICIOUS

PDF

86.6 KB Created: 2021-07-12 23:22:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a136ed8a932e59c9c066d74f48dca83e SHA-1: 487ddbb93cacf612a678559d0ff9cb6d4170ad8e SHA-256: 577d7319aca14dbaea440fc92c10d67d5c27fdb53dd9a18cb3b79b95ea8142ff
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised WordPress uploads and other domains, likely intended to redirect users to malicious content. The presence of multiple distinct hosts and the use of disposable hosting suggest an effort to obscure the ultimate destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://henri-ruch.ch/doc_pub/file/66572167908.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095d14895521---difewavetazefevetulez.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/a33e497532378ab73f4c6b5012019fae/70789465897.pdf
    • http://csc-0898.com/userfiles/file/20210622232811_tkbady.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/20d99565a3eb22329295c8b1f253a004/80016825890.pdf
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/0bdfb8c9bc9140c70592745ba4af0182/zowunitumajaxanovebeka.pdf
    • http://camptagola.com/clients/66689/File/40782651603.pdf
    • https://opsclown.it/ckfinder/userfiles/files/32852266402.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/a818f9ceaac3ddc4a9a029b53e7d3698/jodororufiraviginuwes.pdf
    • http://endemic-capital.ru/uploads/files/balufafulonen.pdf
    • http://congtyvima.com/images/Download/9491802666.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16080f54e00411---tutetidujodida.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ca97d82a594---zorululuwuliwiduxigez.pdf
    • https://almondzwealth.com/administrator/imagetemp/file/16722787175.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/5146c052c21427e1289c1f8f61ee3efb/povefobir.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/dad820b32b28d6820486899e6b6460b8/73139939959.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607361dbb5079---kefiwipakabu.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/c930bd76876020327eab8c2d1ba8b81f/kodalep.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/ph71ktjr96ge78mb7koqa0o26p/64141253865.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751c9ab0a7a---jusajelekikojok.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/2ab6a55ce4b73b8e02657e61e812c6b6/47534612867.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbe118ad178---bivonuta.pdf
    • http://adams-gold.ru/archive/image/file/laxuwagadezufedirej.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=the+new+school+equipment+center
    • 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_off0000ef2b.bin
192b22a3508ef06525f04038f61f5ac96848c26b3fdfd2210a6b8f81ad380758
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2B 10772 bytes
font_01_sfnt_off000107cd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x107CD 16792 bytes
font_02_sfnt_off00011fdf.bin
6397309378f268b0c53bc06e875a790ce6f3065c5c94581a812ded6af1abefe9
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDF 17264 bytes