Malicious PDF — malware analysis report

Static analysis result for SHA-256 47dc3be96aeb61b4…

MALICIOUS

PDF

98.2 KB Created: 2021-09-01 08:15:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6dce6464778b80943126abaa17d7cb9c SHA-1: 4881c4a27cae78c2749eb70ad9d12022771fbf33 SHA-256: 47dc3be96aeb61b4ca67ccf5d79c34098bf356ec5b77ad353870d695dfa6d080
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, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://catamma.ru/uplcv?utm_term=how+long+are+dogs+in+heat+the+first+time PDF link annotation
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d46aa9c9223---98228105090.pdfIn PDF document text
    • http://cosyromania.com/media/file/larufekikepabugivobati.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/44586969377.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/31m0l4sedfkm70afgdjkb9bgfm/18322792918.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2935eaa158---xidusawiradalevak.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/judigatigikibariw.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/32167449776.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/7ae18a8503d186f35679d3b98a2ae2f8/peduxanuxugulilumobi.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083fb54b2d52---81062286721.pdfIn PDF document text
    • https://filetorme.com/upload/files/gakesasevikopo.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210806_0EB401FABC94161A.pdfIn PDF document text
    • https://mfdesign.hu/files/file/41270447473.pdfIn PDF document text
    • http://duhochmis.com/files/uploaded/files/17777287439.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/mumefujafi.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/35913456514.pdfIn PDF document text
    • http://hijoin.hu/editor_up/11011225616.pdfIn PDF document text
    • http://lawfirm.vn/MINH/user_files/file/kekosozedazularujepanuv.pdfIn PDF document text
    • https://ilmercatinosottocasa.com/file/46153254112.pdfIn PDF document text
    • https://smartcrm.cloud/upload/files/moresujonolanunaka.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210630044156_177703297.pdfIn PDF document text
    • https://aedwea.com/upload/foto/4612355470.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/rinegikosumolosedajelina.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/zasixafaromemisizozexafe.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/86tp541gepnalg0ci8muhjbsb0/90991495328.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/8e4fd21cb030ee673ea37c0c48062dd4/80147822640.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/jekuzuziwukelopem.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_off000119f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001320e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1320E 10880 bytes
SHA-256: c35ef6d4c1410d3762958e7dad84756c733c2897eed1ee15f6372eb3d4577cce
font_02_sfnt_off00014ad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AD6 18312 bytes
SHA-256: 941d35fba2b7908cc5467313ca984a4ca76237e43917adfa6026f5e805db3de5

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