Malicious PDF — malware analysis report

Static analysis result for SHA-256 741dee1cbb3c1671…

MALICIOUS

PDF

86.1 KB Created: 2021-06-27 13:14:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3b69a69babb40822e730c61dd0966f7b SHA-1: 732850dbab7bcad24fe2605680f539072e6cc84d SHA-256: 741dee1cbb3c1671155a0e699580ae687ff8427008d6ad63af33a830febb040d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to distribute malicious content or phish users. While no scripts were directly extracted, the PDF structure and link farm indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607879b705806---wevokenag.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d044442c6---kasadugef.pdf
    • http://s8radziejowice-paszkow.pl/userfiles/file/69506715160.pdf
    • http://chinahongji.com/d/files/12518125034.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff94ddeb81---fudafokajanarujewivuki.pdf
    • http://zonwering-belgie.eu/ckfinder/userfiles/files/25898207975.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2cb769c176---93031833635.pdf
    • http://honyi.tw/ckfinder/userfiles/file/24749394431.pdf
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/gasesonisavenuno.pdf
    • http://topas.lt/userfiles/file/godorikimubadi.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e7960f5c7---zuluvojuroluz.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/8ac4735ebb7cf748f308dd2e253a6af9/revejog.pdf
    • http://webinaris.org/ckfinder/userfiles/publics/files/78243011276.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f47b3c7d59---poxatuxemibod.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b452264dd3c---wozigodikibenapasapatuki.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0835dd545---70162469200.pdf
    • https://cavalier-hundezucht.ch/userfiles/file/bifegedoladovujokud.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5acc765f04---finemimi.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d234b0ea663---36851240222.pdf
    • http://sattamatkapatti.com/userfiles/file/47353030522.pdf
    • https://stiff.pl/ckfinder/userfiles/files/22154519121.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/a8657bcd91a67767da45e293dada52ca/44749974810.pdf
    • http://bensonlandscape.com/editorData/file/viwabibunefolegimog.pdf
    • http://sicilalluminio.it/userfiles/files/puzolorevutef.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=iq+aptitude+test+questions+and+answers
    • 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_off0000eddb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDB 16792 bytes
font_01_sfnt_off000105ed.bin
195ffe28637b7c23ea9389fc0b9a4802c324b13af9852809309d4a97f976a240
pdf-font-stream PDF embedded font (sfnt) at offset 0x105ED 17168 bytes
font_02_sfnt_off000132c9.bin
eadb912078bb446aef16b1b1c20e10c3e08396880098e2b47a8fc33936bc47f0
pdf-font-stream PDF embedded font (sfnt) at offset 0x132C9 10624 bytes