Malicious PDF — malware analysis report

Static analysis result for SHA-256 03c0cfda280ba0f7…

MALICIOUS

PDF

73.9 KB Created: 2021-09-02 10:57:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 772a89ab830574b7aa89e1fd9034ae5e SHA-1: 91d0dc61c71959e41a0284627afd9a0533114b33 SHA-256: 03c0cfda280ba0f7743a43e959d025afcaca184103757d2d196db0d8b2bc26e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted from this sample, but the URL structure and heuristic firings are sufficient to infer a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

Heuristics 6

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=pasta+with+feta+cheese+and+cherry+tomatoes
    • http://canigrup.com/userfiles/file/doxamugolelivonivabur.pdf
    • http://mkngsp.ru/upload/files/jesaredigotabaz.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/72f982387dc0d4be27cbbf988cb339da/1243451033.pdf
    • https://okazionche.com/files/mukixoxotorororulixim.pdf
    • http://lurome7071.com/clients/e/ec/ec9741bbacd2a64db66b94b03f3cd24d/File/fitezes.pdf
    • http://buffagiuseppeinfissi.com/userfiles/files/tewitenabazexesixuvexazu.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f2a80b0a9---97571728013.pdf
    • http://timebank.ru/sites/default/files/photos/pagefile/lepatixowesetidog.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4c3b79f21---toludibajeliwibutapapupiv.pdf
    • https://eledigitalpr.it/allegati/file/76436077547.pdf
    • https://cheesykeju.com/contents/files/woxususex.pdf
    • https://anmimar.com/royal/userfiles/file/52797764168.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b54b2a61d6---94203858377.pdf
    • http://doctour.hu/uploads/ckfinder/userfiles/files/darojebufesa.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/0fad29ad0bf169860ba7d0283fdda264/bigunefo.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd31f5bf75---75808697923.pdf
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/4ed24e6d61fcef323514a2172467a769/47667677767.pdf
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/xovurabokijowibaxogi.pdf
    • http://esistore.be/userfiles/file/xavuwejow.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f98b8444208---surubefesudun.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610a293495225---poxumepusoworifabejuj.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/6o1sogfau6kmfp1ofq7j70pbub/vosiweseg.pdf
    • http://jakpaisanestate.com/images/upload/files/ragukedijemavitatol.pdf
    • http://tourbusan.net/FileData/ckfinder/files/20210802_38187A46701E8B13.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1f7285466d---jovuzonomekebipevu.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_off0000beac.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBEAC 16792 bytes
font_01_sfnt_off0000d6c3.bin
ca4f6795470909442cc76c6ea05fa5cf65b10c59278120c62b13e78fdc85497a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C3 10896 bytes
font_02_sfnt_off0000efe4.bin
2dda3cb25067e60f870780935e59c82d42fbe74cb85a6c473c312d5d842efc08
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE4 15660 bytes