Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f54d98a14526e4b…

MALICIOUS

PDF

93.9 KB Created: 2021-07-05 06:24:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7fc6a5de3cdda1f1656aa7ba1f67c3dc SHA-1: 7b5d4b60cbdb21951cf13a6767e250f40a4a31ba SHA-256: 4f54d98a14526e4b61eeff0138c793c4ac0f1083da3c7e8aeac703472f64888b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS upload directories. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ajwatravel.com/wheelmarine/userfiles/file/57362123990.pdf
    • http://apartmaji-zunicmile.com/uporabnik/file/50014580419.pdf
    • https://bearings.vn/images/ckeditor/files/dalipipunabarofevegawi.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce0aa38661---wedigurufefobidiradepalap.pdf
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/60a7749b1571ab9b9e45ce5524531800/91743757427.pdf
    • http://renovator.cz/files/file/gawafudefixifepolovipij.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608aca51b867a---15766928209.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a51807b17---75777566480.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aacc9fea872---55631849686.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/775172db4baede8d22a32d532e51a3cc/sodexetetuf.pdf
    • https://giga-tronics.com/userfiles/files/45049711855.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609eba734330f---zekijofimidepowamumoba.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/c798830b507eaa47335c2718ea3f4aea/nilemabazutukume.pdf
    • http://ciaooo.ru/uploades/userfiles/file/40047299414.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/79s22udr0hj938btm2ahkrggq3/kodowabegajakegekukokip.pdf
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/92n2soik5toe99mq9hdf6kjtbt/617178870.pdf
    • https://noddy.nu/images/file/38666679696.pdf
    • http://toonesk.com/upload/japizazumenoxazijozimi.pdf
    • https://proxus.nl/file/55017067932.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160844dfc5a146---bekewiwodikimarozekito.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16086cb1629c82---38104851682.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/94ceb5e25a62f0e5a1f8b6bc199ef2a7/wirujukolop.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=kingdom+and+lords+apk
    • 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_off00010033.bin
01a8a00d90e4831d2d1986e4c931058e45d8aa8036cc9b0421d2cc9edc3dcb9d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10033 25316 bytes
font_01_sfnt_off000138cb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x138CB 16792 bytes
font_02_sfnt_off000150e2.bin
646e8981efe9a4f597188a510045fd30c57df7dd2492b772424db1918c8bf0ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x150E2 10588 bytes