Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f1fccef9e17c591…

MALICIOUS

PDF

68.6 KB Created: 2021-10-03 12:37:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: fd1609384bd12745d6213d635b01548a SHA-1: 9499df43d79e779914abd1436f864684dd3b40b3 SHA-256: 4f1fccef9e17c591e144d49bdd11fd5d86455e862b36f77038570e55efc514d5
156 Risk Score

Malware Insights

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

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://nothingbutsafetyglasses.com/userfiles/file/50757990280.pdf In PDF document text
    • https://onecre.com/images/content/files/39810627359.pdfIn PDF document text
    • http://budapesticukraszdak.hu/userfiles/files/9342029702.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///98822695434.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/44291172919.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/50998973907.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/zadabumutejuku.pdfIn PDF document text
    • https://masukpt2.com/contents/files/30007746188.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/fifixuzoralomixotabubafod.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/a2dadf589b46d7756f1c98d5f5dc9acc/10481912098.pdfIn PDF document text
    • http://foodchemsino.com/d/files/dejafimewedodeliguw.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/71861424170.pdfIn PDF document text
    • http://xsteelstock.com/d/files/36355445703.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/xivipofafifolewuzo.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/xibanadalemujuk.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/1443916630.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/rejovivovatuwojeremutasu.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/d6af9419fd85acd954677105e0771aa2/54627693724.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/kcotro2phel9s5met6ime186gj/nodazekonobuwop.pdfIn PDF document text
    • http://elsped.hu/files/file/gavajiromamesojojal.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c05484be62---72390666393.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16149c00f4a017---xiwaxiwireforuxosetaveg.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614479658a886---vaniluzipapidagumaju.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/74604071522.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/denulapodotaregikutalit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=god+of+free+willPDF 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_off0000b1ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D0 9940 bytes
SHA-256: 8655877b0c48901c66025f3f420bb785f56f7a73b16f3481b29e2ca9fcc1a294
font_02_sfnt_off0000dfeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEB 14752 bytes
SHA-256: e46288507980ba414e52d55496875b7acd6a98096b0f4d50c325f22b11a7bbc6