Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2a7a8f517e060d6…

MALICIOUS

PDF

94.9 KB Created: 2021-07-23 07:41:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d712e7a7e20b7f2083a097242fa02c9a SHA-1: 65f8f6c69761fac1ba6fccb6327e41146eeb42fc SHA-256: f2a7a8f517e060d61de56beb3434c5e1b6e5160e973720438b820ee43e827d24
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious content or phishing pages. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://didaconcept.com/admin/fckeditor/file/sidedabatoregugekuside.pdf In PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bb607e49262---63186928166.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c64de8b1ba---32895287441.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/35260121991.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fad2e55e68300cc3787101baa1fd373c/fuzamanupamudinefoz.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/nunefemudikeranu.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a562978608---senudabujinogotezakujadu.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d096f5203a---80829151266.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/u3j09mjpj3k219nfhkfjdkb90n/6972463812.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/fofofexijirafog.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/5a5895ed2d4d7d3557711e39936fc6b8/latexexogemeko.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/90f38f2dedb96b894f60ab27755ef906/9170775655.pdfIn PDF document text
    • http://donghotam.com/luutru/files/lijaraguxazunuloxivemobet.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b534ae03f---zovawamel.pdfIn PDF document text
    • https://majubesar.org/contents//files/9686387928.pdfIn PDF document text
    • http://elma1.ru/!upload/files/31671288386.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/kifofatirovagidajaki.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/kaxudiwujixemow.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user///file/_0635661001624560563.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/0qo7vosbgsivtokebprb3ls0ro/josonesibowog.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/034c556374112cff78d5ff079be6bbcf/50061646160.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/65353811848.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4536da296---pixorisiduwovokusuz.pdfIn PDF document text
    • https://purmoradiatoriai.lt/images/files/52688078853.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=photoshop+text+on+a+circlePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFE 10576 bytes
SHA-256: 701716108ba996b261f10df364a8b2c83e5df2ba134c7de598a540ff6ccc871c
font_01_sfnt_off0001281e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1281E 17408 bytes
SHA-256: 9cdbad2fdbb92c5c024eccf9371f03ad8ca0de1bfba2e2e384c00e9b9601e013
font_02_sfnt_off000155c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1