Malicious PDF — malware analysis report

Static analysis result for SHA-256 410ffdd0bd3c1943…

MALICIOUS

PDF

85.7 KB Created: 2021-07-03 04:57:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8a25b029e8bd601f409fddc83ec5f9c3 SHA-1: 1ea9fe384363100d80f413e6eb33347c0739049a SHA-256: 410ffdd0bd3c194390bb8e8c168dab5c86d3f647f635efe997b4f1d5a9e4573a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The heuristic findings indicate the document is a link farm, with many URLs pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to distribute phishing content or malware. The ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://publicbridge.pl/userfiles/file/8433571619.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c72bfd2ae52---wotaginen.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160b54755bc4f7---71535818942.pdf
    • https://aimtronu.org/userfiles/file/kakezozakagale.pdf
    • http://chieusangducphat.com/uploads/userfiles/file/vuxome.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb1e25a3ef---19035530291.pdf
    • http://www.jobsincrete.gr/images/_user_na/file/12421310182.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/6ac55625a006398b8a3aecdb56363720/46806014589.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/9s9eghq9h46mgkk3vio0ibvlqv/2568463660.pdf
    • http://geoplan.su/userfiles/file/78288519200.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160711679c46d9---luxabalipujujugefosupuv.pdf
    • http://ijdssymposium.eu/upload/gugefex.pdf
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5d1a1eac5---55281092021.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1606e9274ccacf---bipuvuraguvo.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/bf450e1861ed784f1d5998a2e74209c7/tebujawababevetusegix.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/sejokijorilatifofogiz.pdf
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/12304efbaade178b4d68f930d7af9a01/50437768324.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5fdb45c31---39370846721.pdf
    • https://marwaautorepair.com/nbloom/fckuploads/file/83472985577.pdf
    • http://amandatour.ru/js/ckfinder/userfiles/files/fejixozasokavudin.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=latkes+made+with+frozen+hash+browns
    • 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_off0000eaec.bin
827ef61d36d833ac82809aa39af3e587dc8abd74ae95498b9b3abbb1a3090611
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEC 10908 bytes
font_01_sfnt_off00010414.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10414 16792 bytes
font_02_sfnt_off00011c26.bin
209127546a9a9e7af10ab2cd8d52618513f41b1c932dafd1f4c27054a41aa24b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C26 17528 bytes