Malicious PDF — malware analysis report

Static analysis result for SHA-256 59bae7cdde7f89c1…

MALICIOUS

PDF

89.1 KB Created: 2021-06-26 03:47:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8af501f687fc69a46512d7b86cdbd536 SHA-1: 3812ca74c28f9eb896e0464b7e483e3d50291e94 SHA-256: 59bae7cdde7f89c1bccf3857fa0889af672bc0195957d211acf061ea40505a3e
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS upload directories, indicating a link farm designed to host or distribute malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/82a60bbe2dd0798b93a7a971d749c371/xipen.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd8b1417f4---53351332720.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c416a57c732953f193ad3422f6bf6547/76317884902.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ff431cad0---10271453716.pdf
    • https://acronimocostanzo.com/userfiles/file/19879664804.pdf
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a6b4c0751---8613347202.pdf
    • https://aymsoft.us/aym_image/files/47862327809.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/0276f8e350a5f9e4c3bd924a318f936c/mebozomusut.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/rlraen6sh1js4o2mq5itqdv1l2/28595624572.pdf
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/ihi0d3pe40dmtrrooieqdruo64/tijigexamaresugarij.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d242cdad2d6---76689882429.pdf
    • http://nowyhotelik.pl/userfiles/file/58030496507.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160918c8089a0d---24092069049.pdf
    • http://atdawnwelift.com/userfiles/file/41565412553.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/f3bh2202a70stkk63m04fbvlf8/28389923113.pdf
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160793ef59b2b4---mixikixulape.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/11340fa723f06c8903995291b5a9a3ff/12719689357.pdf
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/122ec6eacbaea38f0e7287da5f49c5e0/diguga.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607a545c02dfd---farozovisafig.pdf
    • https://proxus.nl/file/gonipiguxiwepebenodijaxul.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/8rujs9vinin9ciupqspako5h60/jozinebot.pdf
    • http://self119.net/upload/userfiles/2021/06/files/210618201223.pdf
    • http://perfekttorun.pl/pliki/pawavemego.pdf
    • https://eatorhours.org/e-bussiness/fckimages/file/vujelab.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c6cd16b30---34328205.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=search+engines+for+pdf+files
    • 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_off0000f80e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF80E 16792 bytes
font_01_sfnt_off00011025.bin
bc5835b007ec0e908a8fb7285d19d1bb2e0df046698ffac496a98c14e39e9525		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11025 10876 bytes
font_02_sfnt_off000128ef.bin
f0402b3096a6de066a9242563b7fef5fed29a5289bc92b32dcb7bbb93b80d7b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128EF 17100 bytes

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