Malicious PDF — malware analysis report

Static analysis result for SHA-256 27340b377a42dd5c…

MALICIOUS

PDF

88.5 KB Created: 2021-06-27 09:14:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 49b6980c705da96cce9f0576e6aae7e1 SHA-1: 055b85596dbd9b5555b3313a3ac9b16ee49630a2 SHA-256: 27340b377a42dd5c7c21e7a89608334674e843c8540470e4c27a3271a4e860bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm or phishing lure. The presence of PDF_URI and EMBEDDED_URL heuristics further supports the attack pattern of directing users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://jordanadams.com/ckfinder/userfiles/files/memutekosu.pdf
    • http://chinahongji.com/d/files/jufogelapunugosoxaxefuxoj.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf350b9808---61194693396.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad3a3ac57d5---gidofujaruzi.pdf
    • http://goteneplast.se/files/images/file/470870090.pdf
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/d543c52fa78cf043a158b234a65c5dda/xazimugetonumata.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa31caa900f---logimuwiror.pdf
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/6b53a9fd879bbd470c6bba6bfade6720/tirup.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aabea1251ff---sasopudalop.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a47adc2ab1a---lijosatelejeragikomir.pdf
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/229276bf01fa88f775b9ee7a54430ddc/6781832570.pdf
    • http://1984wnhs.com/clients/2/25/250e0aaa51dad033202e6c34d8602b4d/File/50936509039.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d1f6e0dd0---60887329326.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/1666a052cce57e88204a37e1d649c91f/24539997511.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f2fe4e17c---22874882061.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085cdce8d9f4---loxuwugotokizadejasij.pdf
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/butiwuzigajipaw.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5779d7f374---62124355928.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb608b686d4---gosijuvaxifuzafufipibap.pdf
    • https://pet-fashion.ro/mm/file/43139841285.pdf
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/g36vmf2403qmbr3jdokq7re4n6/48321642158.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/ja4ln3708q72s3jp5abu0uhqlf/rafifuferepikadudonuvi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=pastor+monica+ross+and+family+praise+and+worship
    • 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_off0000eee8.bin
8fd885ea703897279d807a6c33b40c112aba777539d885e776cee9c3b0cb1bff
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE8 11088 bytes
font_01_sfnt_off000108a9.bin
e56bc01440d2091580bd5e2362529185ea795323d67581993447001b8bbd206c
pdf-font-stream PDF embedded font (sfnt) at offset 0x108A9 19728 bytes
font_02_sfnt_off00013ac5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13AC5 16792 bytes