Malicious PDF — malware analysis report

Static analysis result for SHA-256 3baf0f8aa51eb26a…

MALICIOUS

PDF

84.3 KB Created: 2021-06-26 00:19:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f2ec816883c1cd8f93376c239fa78e01 SHA-1: f4b310999d08dc62975deb56dd20ace84c27ee3c SHA-256: 3baf0f8aa51eb26ab8d3ef4a28acf0e46ed9a03e30a4129ede3a50dab47b51dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites, likely to lure users into phishing scams or download further malware. The presence of external URI heuristics and link farm detection rules supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://philabc.ru/uplcv?utm_term=it%27s+easy+to+play+abba+pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a452928eca---23805063575.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f5c4bc2b9---80302651908.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777f337ed43---90534220442.pdf
    • https://foundryindia.org/userfiles/file/tirorevon.pdf
    • https://muguet.fr/sites/default/files/file/tejotunovukobe.pdf
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/6e5a95ecbfee013897af727bd898e897/difijaxe.pdf
    • https://dgaspcsm.ro/ckfinder/userfiles/files/34248666768.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/4f8ab3a4ecacc770341965e68cbe9cf6/veregolejativu.pdf
    • http://www.europesolidaire.eu/userfiles/files/34326860762.pdf
    • http://vaughanreunion.com/clients/7/7c/7cfe0b8ff6d5e3136a6575a9b258a09c/File/53078032434.pdf
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e860fbed5f---79995660053.pdf
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/c694f14b1e30d27344a2283aa83517c4/jerazisilane.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbff92fed1---89304467019.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f27e00d395---14387487807.pdf
    • http://akkoryazilim.com/userfiles/file/xesazotineridonudizigej.pdf
    • http://lateonsettay-sachs.org/userfiles/file/zumijub.pdf
    • http://liebherr-tr.com/userfiles/file/19166678521.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16075b528525ed---kifinozesowexotovozelive.pdf
    • http://phanphoiongnhuahoasen.vn/upload/files/41180474991.pdf
    • https://rajakeempat.com/contents//files/78166780397.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/9b5c714e088ccaed2455381b5f044715/razivubusuwexi.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/m7qlepsqoea7jhpbqeugkrc9k5/75432907462.pdf
    • https://asi-filter.pl/files/file/duxemaxikawusineg.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/6d2t1rotsl9q15b8vtua36ugo2/61061179797.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_off0000e52b.bin
6d39a919c8fe7daadc3a6c23426c0fd93822ed2196a359da383186ab96ee842c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE52B 17976 bytes
font_01_sfnt_off00011439.bin
f22fe640d3285bf6558f30a65812c624100cc0e24cc3f164ffd2f9002c748c3d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11439 10432 bytes
font_02_sfnt_off00012be3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE3 16792 bytes