Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f488a265b50282f…

MALICIOUS

PDF

98.0 KB Created: 2021-06-28 00:50:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 52fbbe42e8f4488e4387cc45b7980a35 SHA-1: 0f33ef475a8e03f97e49d165209a76748f43423d SHA-256: 3f488a265b50282f2a246eb56bcd83f3efc020d9199a045dbda60dd0d85257c8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites hosting other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to download further malware or engage in phishing. The presence of multiple link farms on potentially disposable hosting further supports a malicious distribution strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608091dcb1b5e---pozazibidinazikiwi.pdf
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b65026e53aa---gomikejuvenevadidijopirek.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/a83dh1sr8gihih9u16r34m7c3d/92023347459.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/o2r6dhioq1hsumtb3lnra564bs/fopevo.pdf
    • https://clap-bas.com/userfiles/file/pivajifajexizowowejipeju.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/d4d70d66b43b670489de51ac76a64f3a/sarupakido.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/15a514cea1570fbefe94e5813272ab7b/venaludapijixet.pdf
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/60039068518.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf2e93799a5---vozadefisujolidibat.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/81da36cb06e1e7cdef09a6b06929d27e/vuwejegadefapo.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16076cb81d6271---reriwikuxami.pdf
    • https://designclarf.it/file/64465467596.pdf
    • http://ingenermarket.ru/userfiles/fijamoto.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ce0ofi1e8uqu1i8jvu4e0a4bh5/lofedabojunivor.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/5bme1dri8t176kh469thfvr5o4/21166372572.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160a2eeecc6c7a---68028963587.pdf
    • http://www.toptehnik.si/images/tijekedijosoxiref.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a5909d149e7---69092025360.pdf
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160841b45adf5c---naten.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/7af9d8d47acf279ed3fb16cbb44382f5/jixusewuwol.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c53965d705e---79969830416.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=last+day+on+earth+offline+mod
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f363.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF363 16792 bytes
font_01_sfnt_off00010b7a.bin
8b7df6430df49a3e9ec72989da6267cfb2206bfb7185822f6b00e6852773525c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7A 10688 bytes
font_02_sfnt_off000123be.bin
6bc4420bbfa61156f096b6f0725168f8601d7500e332933a6f3144c23c09a2fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123BE 16384 bytes
font_03_sfnt_off00013a04.bin
7807f296b1fd0a3020429ee652c30862ca4b056b22c6997688457832f4ceff01		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A04 31796 bytes

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