Malicious PDF — malware analysis report

Static analysis result for SHA-256 5027413873c6b1fa…

MALICIOUS

PDF

69.4 KB Created: 2021-06-26 21:04:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: edbd15b45d54b4b9f63f4c61a715302c SHA-1: c9e452b12b92101e6d389e7f38c5458dafdd56ac SHA-256: 5027413873c6b1fa286d6dc04425a85e13ea5c1580b5bbdaa1dad37912e1b925
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF exhibits characteristics of a phishing lure, including a screenshot-like appearance and embedded links pointing to potentially compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://planet-for-events.de/userfiles/file/67564241747.pdf
    • https://artenika.pl/fck/file/32886235112.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab05be23d8b---74422354971.pdf
    • http://info56.ru/userfiles/file/kakazurabuma.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf18d2e2d0---julufanigafowodibetuki.pdf
    • http://dachastyle.com/userfiles/file/74329185965.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607284fe0c936---88171740643.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609727546ef3f---xuvemixabikodibubub.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c87760bc308---tevaxarowidebegogoro.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/839576c3e8a4fe893132d48636809295/69062486488.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-6-22/20210622143941169297.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606e798cd784c---71880816527.pdf
    • http://foto-preiss.at/upload_files/files/72445728794.pdf
    • http://sshs1962.info/clients/3/33/33dcd814b32da85629335a95ab3d0158/File/remerajefasifer.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3cc5b173c---54492551519.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd96f64161a---xapapitamujis.pdf
    • http://fullcolorspandoeken.nl/userfiles/file/53439403656.pdf
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f255391343---nenav.pdf
    • http://animalscipublisher.com/files/upfiles/file/fuzotevuluven.pdf
    • https://girilawfirm.com/content_files/files/40674753262.pdf
    • http://kamnitikamini.si/upload/files/vuguxexekabutipijuzajul.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/5fd5482d1ca0f94028dd76b296ca8302/zujebopote.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072ba3ad15f8---duwobob.pdf
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/c263ba65f37e78e0d77799cb5d846142/18893880885.pdf
    • https://thietbivesinhanhhuy.com/asset/files/wolimizevogagaw.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/6f5a8954f8eda640a06c64081e816e27/96355442114.pdf
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d70474b24d959ba397aea3ddf0a72343/47527242836.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=hershey+chase+experiment+diagram
    • 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_off0000b5b9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB5B9 16792 bytes
font_01_sfnt_off0000cdcb.bin
3cdd89673523bdb53c9b8075efb6304db126d927b7c26460756bcbd7caccd7c3
pdf-font-stream PDF embedded font (sfnt) at offset 0xCDCB 13676 bytes
font_02_sfnt_off0000ef7e.bin
5d7c808b9af6c286e14c5b5c508859c8d614dc753308c1858885262ae3d7f357
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7E 11004 bytes