Malicious PDF — malware analysis report

Static analysis result for SHA-256 53933f38a4aaba8e…

MALICIOUS

PDF

84.0 KB Created: 2021-07-08 01:15:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 69c44a490bf8dd564d8fa85f3f734fea SHA-1: 3ec31668b4da573d1ad1173fc7df092ea09f2aa9 SHA-256: 53933f38a4aaba8e804262e30e5dd6549998cdcd074cdefedb00961602403299
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a large number of embedded URLs, many of which point to potentially compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://irlanc.ru/uplcv?utm_term=jacquees+not+into+wasting+time
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/b50bsmq7j9rq0akk189d77jjhh/mewagemokuxebemaxi.pdf
    • http://anandtouristcorporation.com/uploads/dulezotisomagazi.pdf
    • http://studioego.cz/userfiles/file/bebibod.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c14ae1dcdaf---58855801785.pdf
    • http://157.230.241.115/image/upload/File/domigo.pdf
    • http://immobilieninvestors.de/userfiles/file/xesirevadexosazegawika.pdf
    • http://kag.fr/userfiles/file/74365974758.pdf
    • http://archi1919.com/smlclub-files/file/mosujow.pdf
    • http://buffagiuseppeinfissi.com/userfiles/files/didotagunutevivebixosisi.pdf
    • https://ilcaminodaugo.it/file/rekikonipigex.pdf
    • http://studiobardinisrl.com/userfiles/files/42772626613.pdf
    • http://am-assets.com/aom/magnolia/userfiles/file/24577685892.pdf
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/19fad07fe9bbdd63126a34661c716408/kibizogajok.pdf
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/4cc85f3fc506a7e7afe46b996a20c8c0/30126560944.pdf
    • http://flomojapan.com/upload/files/siburexumidivi.pdf
    • http://ash-graphy.com/userfiles/file/83240614811.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac4267bf25---visizijekegedubulas.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c8acc7d244d---66113615321.pdf
    • http://tremonttemplemacon.com/clients/862779/File/bebeparidinutoridoseza.pdf
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/tubetazibimu.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160989a5e013ec---7437937935.pdf
    • http://ray-king67reunion.com/clients/41562/File/mazobimomapevo.pdf
    • https://ryokanclub.com/FileData/ckfinder/files/20210708_8D09CBCD1BAB5473.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/6fd38ea6bf7ebe12852915e9ba2fec4e/98727507662.pdf
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/6868aae2527ef200608007f279f12929/fipadagikepufot.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_off0000e4b0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B0 16792 bytes
font_01_sfnt_off0000fcc2.bin
a3eb91ab8fc8d656c7b98e03f7474d3e78e51cafb3910670004fba27674857c0
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC2 17932 bytes
font_02_sfnt_off00012a46.bin
48a1074c9a18dbbd0f4705a0494b5eeefb2c5bfc52c2349ef3260286bdc663a6
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A46 10752 bytes