Malicious PDF — malware analysis report

Static analysis result for SHA-256 2552cc550f20da64…

MALICIOUS

PDF

99.8 KB Created: 2021-07-18 01:42:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3ec42bd788c6f20f66375c9196e168d3 SHA-1: 16849f7c7ff76c740cf67f0996dca96326d8e24b SHA-256: 2552cc550f20da641b56f4fbb9f47edb3baeba0db0af076bf10056adee095f87
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://bjjewels.net/nbloom/fckuploads/file/68476982886.pdf In PDF document text
    • https://avenue102.com/uploads/file/21050933597.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/71463676254.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a6404ba4b87---65028310177.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/c052ee12a281f438c0644c10b9269a44/mebimakopiletepuvomagif.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/43176077487.pdfIn PDF document text
    • http://farashimirooz.com/files/zivirujuvujexutudoxesewo.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/f14bcf8038a073d1b0dbf0abdfb12125/kifubureketaminedorudaku.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/p77l2of433kebftmpa41m0i731/gokaxuso.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160714b0bedabe---80612838111.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/togepise.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b90988a52---zawij.pdfIn PDF document text
    • http://fletcherfamilyreunion.org/clients/52745/File/rotobelozogetejaxukiguj.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/a491e3932ffd4fb76bc878fb5b48e37b/9637404081.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/wabelemozegeku.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/62214449641.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/jcls33fhebt22m94hh972m4307/xusuxatusoxaze.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/sofjl9un6bgp3r85tt1btfcecm/49334631987.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/suzisedafilotitobanani.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16083b979df6c9---josasenotuwijerule.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16080942c4a64c---52280591138.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095abf3dc4d0---gasulixavexijabizetuvixol.pdfIn PDF document text
    • http://coffee33.ru/archive/file/nofewotuwibozatazon.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd7d9d34f3---nobejotimotuko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=classic+warrior+tanking+guidePDF 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_off00011ea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA8 18440 bytes
SHA-256: 16e6aa63301bba5fb64ba4656fdd09313ac383dc7bbb0827a84e6f8d278426bc
font_01_sfnt_off00014f6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F6F 10856 bytes
SHA-256: 10d6e050e94a0d093201fed166fef233e5ef2afb04fcf1acf76c5a9677a3fb30
font_02_sfnt_off00016886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16886 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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