Malicious PDF — malware analysis report

Static analysis result for SHA-256 b220918c7fb4083d…

MALICIOUS

PDF

87.3 KB Created: 2021-06-28 07:21:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5f5f531d1eade4860615dc598237f426 SHA-1: 184fa81d6e2f76243221f1d276b447d1775607c1 SHA-256: b220918c7fb4083d9184b05b5fd09218c6e7425cef71380d034d1d0652b16a21
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable domains, likely intended to lure users to malicious content. The PDF structure and embedded links suggest an attempt to exploit user trust through deceptive redirection.

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://synerhu.ru/uplcv?utm_term=conductor+band+theory
    • https://prcomponents.com/ckfinder/userfiles/files/bavobibij.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/5oiq44d994mdh3m9hb8d20ftct/fosixebilexulasogos.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bb79b920b0e---3006633459.pdf
    • http://denis-lefebvre-services.com/fichiers/file/39722536217.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/vskjp8h2eb15h043a8ltsjn56g/fazulojakiganito.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d01fc2e6fe---73893578216.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/36981416ea09a5fd4d35cbc13f8fc541/65031958836.pdf
    • https://savitravel.ro/ckfinder/userfiles/files/75683467059.pdf
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/a8dff4e59260b89dd07c96a0f52aa791/74568958541.pdf
    • https://blogsma.com/files/rotevitesiramapafoxiref.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c556d55ab---94367052881.pdf
    • http://tebsc.com/clients/84181/File/baguzasotuxopot.pdf
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/bgldq3fuor90jqhhtojk1ec9jk/kibufofezexurisijogomiwa.pdf
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5000f0bde---36856229456.pdf
    • https://samowar.ch/upload/file/tudami.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608544da9938b---jopivofojixese.pdf
    • http://www.companyforte.com/imagenes/editor/file/segededu.pdf
    • https://calmoinc.com/upload/editor/file/mefutitibuzowuguxewo.pdf
    • https://hotnews.md/upload/userfiles/files/wabudubunajefobiz.pdf
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3e803258a---berojerofupag.pdf
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c422453d747---35349966445.pdf
    • http://richmore.kr/uploadfile/fckeditor/file/linizokato.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb56ed9eada---37479438426.pdf
    • https://laps.pl/userfiles/file/gosowatalisotozipite.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/nebl67cv3nc3likq919of6jdgi/gosopiliv.pdf
    • 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_off0000f2da.bin
353dcd63e38e98a87d7dbd5893813bfeb6785e0a6d77f649eabed9f06892bc87
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DA 17384 bytes
font_01_sfnt_off00011ff9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF9 16792 bytes
font_02_sfnt_off00013810.bin
428b12e2277f629504e7e670cdf4711399a2f49d4feac6518ce81beba404d875
pdf-font-stream PDF embedded font (sfnt) at offset 0x13810 10544 bytes