Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0f7f83150f89b57…

MALICIOUS

PDF

89.6 KB Created: 2021-09-03 05:27:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 287a939982066eda52b3c102abe34d47 SHA-1: a214b66da41dc4aa980760de3003b13f7faa9842 SHA-256: f0f7f83150f89b57e25abdcde36f7658f0a8d19bb96c7e6d25beb294cee2e99f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised CMS upload storage, suggesting it functions as a link farm designed to redirect users. The presence of these link farms on disposable or compromised hosting, combined with the 'utm_term' parameter often used in phishing lures, strongly suggests a phishing or malware distribution campaign.

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://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/dba6b0c850019c4200ffbc1db6feaa24/vutomoruvuwat.pdf In PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/64cd04fb9aedb9b73e823f72025beed0/mokavabomejudekigidigawi.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/9845bcd913ccf2412aec52035827356f/78241429661.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/rqckbk1kgi5fpj06qvu52aglae/ditap.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/65965310020.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/51113447896.pdfIn PDF document text
    • http://boatmonies.com/uploads/files/gizinode.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/510bf678b0f25ef5bf2268334cf358f3/pesulolawevanamoseriz.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16078b10ae94e0---sisofibulizixawit.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/bnv03b5r718p7bhp9lssop8830/9252931928.pdfIn PDF document text
    • http://chlahb.com/uploadfile/2011/new2011617/files/2021/08/20210824195133.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607583b046f0a---64885407732.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/dilozotobixinulumurat.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/80694499123.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/rumodunujonajekubowepako.pdfIn PDF document text
    • https://citrasas.com/ckfinder/userfiles/files/3669056963.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb608b686d4---gosijuvaxifuzafufipibap.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/repabolozu.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a390e8d75b3---zepazip.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/97313453015.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da2fcbe4b3---36570431380.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a5196bb5588---20756317448.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/piputumupo.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1608c58102b43d---19175556473.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=pokemon+xy+pokedex+pdfPDF link annotation
    • 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_off0000fb76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB76 18160 bytes
SHA-256: fd69137955760fac05ec554dff3fa66cef4a882730052cd95d4570d06a46a80f
font_01_sfnt_off000129dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000141f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141F4 10300 bytes
SHA-256: a94330d056cd72d4152130a091ad7bb1c40aac4c0553b3b88ad98612a2982323

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