Malicious PDF — malware analysis report

Static analysis result for SHA-256 32cdace7207c5c8f…

MALICIOUS

PDF

71.5 KB Created: 2021-09-04 12:22:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ee8ba922673449804aacbb221bc4a023 SHA-1: e5f8bd96666aa60bac3508a98d821e68929ab161 SHA-256: 32cdace7207c5c8f7f3f2dd3040348560844e03ee43023c77f6448829965a940
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the PDF structure itself is used to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://pixomot.ru/uplcv?utm_term=subirse+por+el+chorro+cuento+pdf PDF link annotation
    • https://vildmarksjagt.dk/userfiles/file/11919392718.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/jafejokaveviw.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/78640140461.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210705_EBF9C2A45EB9C850.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/4b4123f12b24404ed82c7aade2d2b99f/40288145504.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/66688126323.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/bc90870a336712a2642871b26ee7e283/81698318593.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/kajorekuwijib.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/f9r42j78jqvpjpeocbqjeqp7dp/51168333650.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c13db8e4b11---89584099151.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/tegogamukenezunufefadus.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/55065029.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/mebinokewidixarejolepa.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/vufuniwitibemuvew.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/jusoponubizixapa.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/mapewulidezuwuxarazofi.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/38413546524.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/vomukifepipodevuremaf.pdfIn PDF document text
    • http://ippon.lv/uploads/File/79264787160.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/sk6hp99bvsds8dccopta5culp1/xabegeba.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f02879d5f---kiboganopipafavifemali.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/povanamasifoba.pdfIn PDF document text
    • 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_off0000b56a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB56A 16836 bytes
SHA-256: 42c33405f55bdd5fe7e516a48c280f6bad1e7c195107a8894be9b84402eb3881
font_01_sfnt_off0000df77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF77 10872 bytes
SHA-256: 119a1915191a3ccd72f9c713ca2374a86dabe8d9dccb5cabd2fb99674fc13ad9
font_02_sfnt_off0000f842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF842 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1