Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cf1f8e5520d7e21…

MALICIOUS

PDF

91.5 KB Created: 2021-06-28 08:15:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 400eeaef7674565a73e9eaac1496fe28 SHA-1: 246b7889476eba65d2c3355b25c09b09fe9aad1c SHA-256: 7cf1f8e5520d7e212e09cca5915b270d530b0ee68d1329bcb63a31559ad09d8f
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The primary malicious URL identified is http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084848d656ce---dejotedimal.pdf, which is hosted on disposable infrastructure and likely serves as a lure for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084848d656ce---dejotedimal.pdf In PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/0a64c0f048a9d8e4779aee476891f9b3/pexomoleviv.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac269eda268---47586095605.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/bagise.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/35312652985.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608acc2a9d1aa---tituwamekoxuxur.pdfIn PDF document text
    • http://markone-tools.com/upload/files/sufinafivefubeluwud.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/33159937699.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/xexuladi.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/62241042453.pdfIn PDF document text
    • https://prosperitas.be/data/assets/file/10048581328.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/272e069af82d494012082c9399777360/68909687533.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16078a421dc4fd---vugadibiwin.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16095d6ee3e444---doripezizakam.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bd43273f00b64f21514645fe3efb4be8/potigudodarolupoxesaruxap.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a205595da34---45252313420.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/164e623b8762bbba0d36dd1aad2319f1/87148961080.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a53b590d3f6---nosexu.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/87029453295.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/zesarikubuzepaxososunapux.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b106be44da8---xupikakunexudovitaj.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210528_B2EDA13FA5AFB3D3.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/a6f58b1c73f05e7318bca3b7e4d42ac5/5792363985.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16213244688506.pdfIn PDF document text
    • http://email-database.info/userfiles/file/jokofofavefodetow.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/aafb2f7cf584dfd7e0a03beb965edca8/89469757558.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/778d1a1a5e27a2aec2828baf7ffec185/wasobejar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=seeing+stripes+in+visionPDF 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_off00010428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10428 10360 bytes
SHA-256: 0d3a1b4454995bd89245be74f9bd0faf5baebfa05b79e0e7425f3b8f9de6c068
font_01_sfnt_off00011bb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133C2 16836 bytes
SHA-256: 42081bb4c9f200270999859d80ff7425876f503cc899121856072758527a297e