Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae3b7d0e3778b003…

MALICIOUS

PDF

73.4 KB Created: 2021-09-04 10:06:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8e57e478f07ac87fd53279f891cd494c SHA-1: 2c78b41ad8580b1ce2618d1d0c7850a514d36667 SHA-256: ae3b7d0e3778b0032d88ef9b8ca6cdaa04d9b172869c694386020c117f015ff8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The primary purpose seems to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://catamma.ru/uplcv?utm_term=signer+document+pdf+adobe+reader PDF link annotation
    • http://zhihepvb.com/upload/ckimg/files/202109031032409776.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/jogirulezawuwe.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/d811ff556f4f473084930b2a65ce768b/kijerenufixoxet.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/46354896258.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/873c579d6bc3e07f9086dbee4a957a2c/87786788855.pdfIn PDF document text
    • https://thebookonpersonaltransformation.com/FCKeditor/file/nosiwezoxoxujito.pdfIn PDF document text
    • http://gibisch.biz/files/files/wisenetobazitewijore.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///2021081053338_194787154.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/51e7fa49ff31ae7cb99235a8403dd4a9/25176411628.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/73910857266.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/basak.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///nuzezevepiz.pdfIn PDF document text
    • http://gw73patriots.com/clients/1/1e/1ed986c9d410becccfd9995a8318e329/File/10624789179.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/5c5auhh8l9h369i94g41amau87/58453755929.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/dc696aed621c4b626ec201a93dbf673c/75761253545.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5b536f8f6---favabezikozuzepud.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/gokadu.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/4e28d54fff120d4f8dcfd7eecd641c1d/dajumarugagetulujif.pdfIn PDF document text
    • https://shevian.com/images/file/27425112952.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/jddtoc5gttd8g3mt5in12o5ss3/fidubobizolutujobumaw.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610a457f75ae9---xamalopasefijelokitenun.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b05e38727aa---gopupavegidurupufut.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b487cbf1ebb---80024471965.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebf2c7bb38---16490734698.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC7D 16584 bytes
SHA-256: ce676c07780cece209a3bef4218f7047648b25b923c6bfa1db970eda44952742
font_01_sfnt_off0000e68e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68E 11064 bytes
SHA-256: cf089ea8b94c7a04720349c323c05e3b30a4178ecd15667cbbfe8460f21ac90e
font_02_sfnt_off0000ffe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.