Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e58044effb8c6ec…

MALICIOUS

PDF

84.0 KB Created: 2021-07-02 22:34:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7297ac9e8b4a31f3128415667883a676 SHA-1: b554ee1ba37a3374373fcd9d0fb437695a6f3ae9 SHA-256: 9e58044effb8c6ec56eecc80746993a4bcb2b092f010dc4ac86c6c3859c330da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm pointing to multiple distinct hosts, many of which are compromised WordPress sites hosting PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8afb6d3f9---mumipakuxe.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b522d7d6017---tezefupo.pdf
    • https://www.foundationofhope.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9bfe8e956---ragabigetulakeriz.pdf
    • http://hotechike.com/files/files/44790463889.pdf
    • https://btcauction.vn/hinhanh/file/76338590594.pdf
    • http://malopolskiszlakwinny.pl/upload/File/naposemo.pdf
    • http://sahrugs.com/userfiles/file/84017880418.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/93sea9use8gbsvoe3lct6inlk0/fitikebubidularezumuvesav.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/f425a12130817b7ea81794128d7806f0/niwoletagusubiroxujejer.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/cb4a070473f462fbea587ddfad47465b/rotibifomozar.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a14cce0d2e2---bufavorifabumufepugavoso.pdf
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/65778659441.pdf
    • http://alphabodysupplements.com/newerac2c/userfiles/file/45242006815.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/029bd46defc901fb68cba8683fe38999/74005086216.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6d0e7176e2---25348350046.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/2e6009d28431dd23897abd148054c0aa/99372070065.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e6c579a3c---pokemasowedigufol.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/e29588514fd369eedc344fb75e7f18b0/93171534736.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a79dc562e83---texutoxazabijit.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c434d99b5---bejezatijibisipetorejuk.pdf
    • https://goodluckfishing.com/ckfinder/userfiles/files/virakapoto.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/03c10e3cf5942cf387ecae0a00ba5213/99445376524.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab430b13e31---wuxuzirimaxaruvu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=different+types+of+distribution
    • 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_off0000e18f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE18F 16792 bytes
font_01_sfnt_off0000f9a1.bin
aff2eb622582b13af29dfc0586f2b1fa67414897c9e3e599a6c8180150a73fcd
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A1 18404 bytes
font_02_sfnt_off00012a97.bin
ebed7663e8ea66806589d95f5abbb258bd125852bf1e40709a4426194405730a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A97 10640 bytes