Malicious PDF — malware analysis report

Static analysis result for SHA-256 d28bb16f9ce77cf1…

MALICIOUS

PDF

78.7 KB Created: 2021-06-30 09:57:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 57be63b51d3c63dbb78671cfa379a14b SHA-1: 93b4192055b8d848a13555a6eeaa0868db4e4beb SHA-256: d28bb16f9ce77cf1c57dab82f58edbb971aa2d63a0b6fd52b97bfb709c514515
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV specifically identifying it as a phishing trojan. The document contains a link farm pointing to numerous unknown URLs hosted on compromised CMS uploads and disposable domains, indicating a likely attempt to redirect users to malicious content. No scripts were extracted, but the structure and URL patterns strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a6083c0e89c---kivoxuvudazijiwejat.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d553b9192b---kezerem.pdf
    • http://jhdljz.com/userfiles/file/1624250011.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea32bcd188---dovumejezopitudo.pdf
    • http://mgocsm.in/userfiles/file/rifeduwavolafepitenelaron.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a89606ae819---25577805356.pdf
    • https://tempatpasang.com/contents//files/29287791390.pdf
    • http://aarogyamedico.com/userfiles/file/94612082428.pdf
    • https://pet-fashion.ro/mm/file/dofarowak.pdf
    • http://longchimvac.net/app/webroot/uploads/files/nesobobagi.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16082192762c42---xirujexuxupipipelefad.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9db73f09a---tevunerabuxevurulesitumet.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072bf553145f---lixufojagewokasevetuti.pdf
    • https://faceless.me/userfiles/files/53955519404.pdf
    • https://isabellepieman.com/userfiles/file/gepowuvoze.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/gkjachec6j7903iptien11gt84/48768782226.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609477a694da3---41392636711.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/aef1ec2fd8c91a3d432d2e9f39adf945/kanesuzodiledewijev.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a90cdc0642c---jawifukapuru.pdf
    • http://mu-rrrc.com/userfiles/file/45664077747.pdf
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160ad810b81f94---dilamufofoni.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b307e2355d2---pidof.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/6cd1c6ac154e56aee878637114894bf0/xugijiw.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091091fd7301---rakuwovituta.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a84e54aad6---tawuxelibizunasafubalori.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=book+of+enoch+in+tamil
    • 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_off0000d259.bin
a324c443304ed9ee9a00738975e665c52e20a1fd34ae0f4169a0ec5060295d60		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD259 16616 bytes
font_01_sfnt_off0000fddd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDD 16792 bytes
font_02_sfnt_off000115f4.bin
76cb5d501dfdeba5c57bc606cd9cff046bc1bac778101d9c5c3af347ca80cb6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115F4 10476 bytes

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