Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6d8f55e383a53b4…

MALICIOUS

PDF

68.2 KB Created: 2021-09-25 06:00:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e0c50c45347c6fad034c35b52577d2f3 SHA-1: 5f29e4abf52986da21fbedfec1ac9cc3cee45323 SHA-256: d6d8f55e383a53b48d9a8e3b5f07ab6b92f8c0c5b026fdab4cf43c43633e9674
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document is identified as a phishing lure due to its small size and image-heavy content, typical of a screenshot designed to trick users into clicking a malicious link. The numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggest an attempt to distribute further malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 68 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 http://cn-daomeng.com/upload/userfiles/files/3eebc014fa70b29089c7303ab9cbe8b7.pdf
    • http://gloria-eurex.com/images/blog/file/mikud.pdf
    • https://banderlogclub.ru/Files/file/fowolekavexizatalar.pdf
    • http://studiocalcinoni.com/userfiles/files/98105474470.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16147ffb5b41b3---15126740522.pdf
    • http://www.klimavill.com/data/editorfile/zukafabed.pdf
    • https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/83660888459.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138d146bd220---zudubugitenujileja.pdf
    • https://questyme.com/userfiles/file/farofozevomugowuzonurutet.pdf
    • http://hotelbasantresidency.com/uploads/51833726929.pdf
    • http://fioredda.com/userfiles/files/46121034933.pdf
    • https://big-affaires.com/img/pics/files/luvuwosega.pdf
    • https://botroul.be/uploads/16692289097.pdf
    • http://vividconcept.in/userfiles/file/14344628061.pdf
    • http://tokyosushilohaus.com/uploads/files/47602480814.pdf
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/fowudemov.pdf
    • https://listocrm.com/userfiles/files/silarotewubidawevejupojam.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614e064b5c799---11832607520.pdf
    • http://asvpp.fr/pdf/2912718798.pdf
    • https://e-casainteligenta.ro/userfiles/file/51138023923.pdf
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/35158414540.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=virtual+villagers+2+tech+points+hack
    • 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_off0000aed5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xAED5 16792 bytes
font_01_sfnt_off0000c6e7.bin
10c77b9c655f88939a55c92c22af567f6af0e67592862c5fadca8b3c8ba8ebf2
pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E7 13908 bytes
font_02_sfnt_off0000e953.bin
d6b025b2cdb889d4b718ac79bd4f7fb10205e057434fb89e051bc0e736ea7e66
pdf-font-stream PDF embedded font (sfnt) at offset 0xE953 11000 bytes