Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd2775958b2b3d15…

MALICIOUS

PDF

83.9 KB Created: 2021-06-28 07:04:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f6277ad17b34f780c372cbaf00b88c2a SHA-1: 9b6da05690c34d81e59d65362eff1417a8ba9ffa SHA-256: bd2775958b2b3d15336d08043a5554c9ef3ade1d251a0d7a15912e4b9dd383a4
156 Risk Score

Malware Insights

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

This PDF sample was identified as malicious by ML classifiers and ClamAV, indicating it likely exploits a vulnerability or serves as a phishing lure. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress upload directories and other disposable hosting sites. These links are designed to redirect users to malicious content, potentially leading to further exploitation or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9eebd0ce0---romedenosivi.pdf
    • https://prtl.pl/userfiles/file/76336530011.pdf
    • https://techson-cctv.com/upload/file/75046291493.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/f09985a02a77a99e3d09442f410cacd6/74177437211.pdf
    • http://coinproject.com/userfiles/image/file/refijiragobamodubawumefus.pdf
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/2ugc1cnnob4dcrat47c0hrk6e7/32835368433.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbb9959e6d---berisavalibunesavuxak.pdf
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763dd1488af---bevuxixedarifulero.pdf
    • http://nuestratierrapremios.com/campannas/file/27317562878.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/ad4898237e2adc29ba1668168fa2adde/mezesanovevukigilimut.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/c1c6ff2ab38fe937e6c58214f0a22c16/mizagigivibusenunuxam.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbcc422a5dd---91861819809.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/71b8cee26dd20f1f331b73cfa72d68f3/ravuvoxupiza.pdf
    • http://citysuji.com/ckfinder/userfiles/files/27939706252.pdf
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/0fedcf920e96e4c6180f303608b5723e/fopovogibufa.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbb59bda53---rivodikixunew.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160849dedaa2ee---90871393913.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/ac08a323ae6b52eacec0b17070627562/kugekixajixap.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a149b1bdc7c---topazofuxakatiwaginiwupi.pdf
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc2354f8e5---85689806137.pdf
    • http://duonglaohanoi.com/userfiles/file/mijefikuvonilameturos.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095878f05fdf---97714444975.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee52ac2c14---52491754293.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d54acfada2b---vavetafifemenez.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=unit+to+kwh
    • 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_off0000e835.bin
1f6346305e91d95905943eb5c2599d44cc5ff57da98007eba2916c7a37bffd09		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE835 9784 bytes
font_01_sfnt_off0000fd8f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8F 16792 bytes
font_02_sfnt_off000115a1.bin
9aee1b2934980b18310065e6e51fcfd7b31f966faed8b91c2e6f08ffd42c22a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115A1 16680 bytes

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