Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ec6daae531245c0…

MALICIOUS

PDF

83.4 KB Created: 2021-09-02 08:29:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0b206765da26333c6516950fadb2cce1 SHA-1: e01ecc5fe91a66f9676d15200102ccccbf18ae15 SHA-256: 8ec6daae531245c0c9b44cbfc496c7f77af1b6b24edc6172667a19fdb9cac1c7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c88f81d2b93---72382892239.pdf In PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/7c7l5394fv01gbfpeldh2tpg8u/pavokatekijodakidabigavu.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/9657414243.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/gojegidiv.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a95118d64e0---11207008083.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/tawufag.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/rltr6hpvlhomgtbeg5hvi31mh7/tofifusesokuzetalurukuxa.pdfIn PDF document text
    • https://kopari.hu/files/file/vogokoxani.pdfIn PDF document text
    • https://shinko-tw.com/UserFiles/file/5117387992.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/lajatururi.pdfIn PDF document text
    • http://sreema.org/FCKeditor/file/suzewunexugav.pdfIn PDF document text
    • https://edusfera.pl/upload/file/jimemederulajub.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607235919db9f---meniferegukuzawo.pdfIn PDF document text
    • https://prevodi-plovdiv.com/userfiles/file/97628660653.pdfIn PDF document text
    • http://jin16888.com/userfiles/file/67458089795.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/nisavuxatuzi.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7b2d515d05843043b832a52a7d86de2a/26654823204.pdfIn PDF document text
    • http://theaterbuehne-schwandorf.de/userfiles/file/kesaripub.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/52007980909.pdfIn PDF document text
    • http://heureka-cz.eu/files/wibebaxebaveto.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeaf569c64d---pogekusejaxuxofagoxa.pdfIn PDF document text
    • https://avflash.nl/upload/files/18850371347.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/41416679132.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa33eb4fc08---wixopidomekevifiwoxemu.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/57833484517.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=ultrasound+for+your+heartPDF 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_off0000e4b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC5 16680 bytes
SHA-256: 192ce7e11fe8b4f6cae0c304806d33e7209b6b3d2ad0f81db1ed43045cb05b28
font_02_sfnt_off000127f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F3 10580 bytes
SHA-256: 8dd9d46361c79582c416cda74f81bde114ed2ad28fc2929f860425efccdf9190

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