Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e9bceb99a3da82f…

MALICIOUS

PDF

81.3 KB Created: 2021-06-25 15:24:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 71c5c0d2841e8952ed4cfa334cfc6500 SHA-1: b6e4a5db36c8db2159acae678e937a31df28d782 SHA-256: 1e9bceb99a3da82faf76ca62ef2e063417d9a04806f43b941e039b16d3fd302b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites, some of which are hosted on disposable domains. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdaaab55257---zojavo.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b18b8ecfbbe---78993369797.pdf
    • http://safires.cz/ckfinder/userfiles/files/demoluzopovenedo.pdf
    • https://skyzoan.com/cake/beta/userfiles/file/wininupafazezafagefapo.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac91d52ece6---wuwanutib.pdf
    • http://yuanyoujie.vip/userfiles/file/rofaf.pdf
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/5860621421c901c9e8d557ff320b1a46/temuxurotog.pdf
    • http://bycongroup.com/UserFiles/file/vopimotepivurutap.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/f9uilh89lmp0dgfq809bmul5i1/14294194463.pdf
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/476eb20a8c7951b5a000d6685e959763/90901347891.pdf
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/7395e4996c99e0c04338e651bad91fc2/8119472685.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/5e615dbc76b9d66f1cf1cf08e5887766/bezek.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9187275ec7---powerobofadatoginesig.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c08ef6cd7d---17187629905.pdf
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160922d9f0b162---pivukiluteret.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+make+a+jet+in+build+a+boat+for+treasure
    • 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_off0000dcce.bin
3327ad8acb65e80a5758961bbb5ae44b804a261cf799bd3199c8c482637190c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCE 16152 bytes
font_01_sfnt_off0001066e.bin
7b00d363316a0173788f3967752aad9852ee2f4206bff348f69b48f61cc22915		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1066E 11056 bytes
font_02_sfnt_off00012016.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12016 16792 bytes

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