Malicious PDF — malware analysis report

Static analysis result for SHA-256 504e7f45a6807646…

MALICIOUS

PDF

116.1 KB Created: 2021-08-02 10:02:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5cb34de6c274ac56ab86b65f2c852a69 SHA-1: 60d626f20de3235a1eb24821022454fbff41d33a SHA-256: 504e7f45a68076461a30be31bfda08c65c254b32d2c9abe6690bb7eec5353dd5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external links, including those hosted on compromised WordPress sites and disposable domains, suggests a phishing or malware distribution campaign. The 'SE_DOWNLOAD_BUTTON' heuristic further supports the lure-based attack pattern, aiming to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://philabc.ru/uplcv?utm_term=the+incredible+adventures+of+van+helsing+final+cut+achievement+guide PDF link annotation
    • http://cuatro-pr.org/sites/default/files/file/zozeduzusabebunaxilijukop.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/70745068770.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/fljqvnu5qdfd6c5bfcllt8vlq3/9455327461.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773e8b47af7---12082876048.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/73083970937.pdfIn PDF document text
    • http://distributoram.com/files/file/gifena.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/339301a6426af09a38481a91ea50f9d9/24290254203.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/nadedogodosidikegub.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/zirifagili.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/cb8779f7cc278ada86b692f4e8b03c56/42445459141.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/6e606dc2028657253f6a58a1f822db9f/jenurelebag.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160c3af264c08e---48058791267.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/jemaxesaziguvuweru.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/1695741076.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/v1ush01fir22gcdtji7dda1oa1/buzazukuvesukikej.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/052ebf3f9c713a3f6d50f7104dcfd063/48502373033.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/02c771afcc9f1b3524ee776e4f78958c/69741311256.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bac3651f69---84404706931.pdfIn PDF document text
    • http://954move.com/clients/4890/File/52607968679.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/tefudumopofewo.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/30770441673.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16073383b060cd---tikovaxonenari.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/23062724276.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_off000157ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157AB 21896 bytes
SHA-256: aba820cee6c4231ec8c976b21991892f9df988c782af277f28dea26a4e8b66b3
font_01_sfnt_off00018eea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18EEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A701 11192 bytes
SHA-256: f333364961c3c959a5d7202a979d9dfc268ae76d6a1d1b2b017d718d00c849eb

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