Malicious PDF — malware analysis report

Static analysis result for SHA-256 5189860309ab6f66…

MALICIOUS

PDF

77.0 KB Created: 2021-09-05 12:59:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4cf3ea478199c3eff76bdb33396d8462 SHA-1: b46b2e331fe0ea61dc46640beefca016b843a853 SHA-256: 5189860309ab6f665aa4c9094cb8b78c51edaef77b227480d326ca964160d700
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://wastran.ru/uplcv?utm_term=hareluya+ii+boy+pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872d7ce2cd4---buwaxizosunitofebuju.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea93628bc6---86792650132.pdf
    • http://teplospectr.ru/images/files/27749506351.pdf
    • http://wych123.com/upload/files/sefelov.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aac7817b65d---80787660836.pdf
    • http://worldtile.net/jangheung/userfiles/file/97866088653.pdf
    • http://soundreaming.org/wp-content/plugins/super-forms/uploads/php/files/f604575f82808b2efbae01687d767c6b/70945465997.pdf
    • http://stillincontact.com/images/mails/file/83667375079.pdf
    • http://gdlianyu.com/uploadfiles/file/zetalutaripiruwularire.pdf
    • http://studioarchterreni.it/userfiles/files/65666838950.pdf
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/4570235442.pdf
    • https://avenue102.com/uploads/file/kejexomogaxa.pdf
    • http://cppzone.ru/users//blogs/file/mimogogegafegupezinujede.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a48921f0a91---dozaxunosinupenepaw.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddf2d3a0e7e---torinafiru.pdf
    • http://songiadahoaian.com/upload/ck/files/51807605057.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/163a0d7ea394cddd3569cff35b7381b8/29257758057.pdf
    • https://silky.ae/images/bulk_images/files/pixudipazanojor.pdf
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/nakenasekodiwij.pdf
    • http://heyumpnd.com/userfiles/file///fimimupimosobarigavaxeji.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/f1b8b2dac50227869563e409778a03c8/penezemenag.pdf
    • http://www.petersonassoc.com/emailimages/file/74688666861.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160925dc932d76---misoxigixizizuzob.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b9ed.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB9ED 16792 bytes
font_01_sfnt_off0000d1ff.bin
72ccde3acff3b15fbabe7cb41edb4d558c0ab147ba1d1e2374951a8b3f088489
pdf-font-stream PDF embedded font (sfnt) at offset 0xD1FF 20844 bytes
font_02_sfnt_off0001069a.bin
6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
pdf-font-stream PDF embedded font (sfnt) at offset 0x1069A 1680 bytes
font_03_sfnt_off00010e97.bin
3a6605bd03aa0ec5847b232433b327807561959ecfeedccef0fc94003d79a99b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E97 10464 bytes