Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb967738775a85df…

MALICIOUS

PDF

70.8 KB Created: 2021-09-25 16:31:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e79c23ebed172678e3c1de909c5a0997 SHA-1: 86b582e6cd6711f024cc155d2ff8f21f5f14ec5d SHA-256: fb967738775a85dfcfc18975328929c1c6d8f669ebc1b52ccdf2d25d8cdd96fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution scheme. The presence of 'utm_term=download+app+hider+calculator' in one URL indicates a lure for users seeking specific software. ML and ClamAV detections confirm the malicious nature of the PDF, likely employing embedded JavaScript to facilitate redirection or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://smidgel.ru/uplcv?utm_term=download+app+hider+calculator PDF link annotation
    • http://dolgoprudnyj.inhome360.ru/admin/ckfinder/userfiles/files/xataliki.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/22055473266.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/fetevapojaguwumenolos.pdfIn PDF document text
    • http://dytac.hk/userfiles/92187221367.pdfIn PDF document text
    • https://livermore.com/wysiwygfiles/file/gebakakoxapat.pdfIn PDF document text
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/48239584444.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/32277174325.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16146d7cc1a53e---burazakosuweke.pdfIn PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/jefan.pdfIn PDF document text
    • http://watch62.ru/files/files/9846973682.pdfIn PDF document text
    • https://vendax.ro/files/file/75687344761.pdfIn PDF document text
    • http://effektfilm.de/files/file/90981562010.pdfIn PDF document text
    • http://karcannakliyat.com/userfiles/file/25650402310.pdfIn PDF document text
    • http://ctmmaximoravenna.com/ckfinder/userfiles/files/3012932982.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/nerit.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/dinonolot.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/76771202284.pdfIn PDF document text
    • http://stluciachamber.org/uploadedImages/contentImg/file/pasaz.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/37651371086.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161424fbf0260b---vetakekazekelufegitibeg.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130e6fb96f34---napisu.pdfIn PDF document text
    • http://kaymccarthy.com/immagini/file/75887208761.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/11376956020.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/75437325073.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/sexesofetikil.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_off0000b4e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF9 15716 bytes
SHA-256: 5b19f63665c1ba94977eef30a7b5c8c196ce7c7d9d121bc3ceddf5d5251eb4a1
font_02_sfnt_off0000f502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF502 10628 bytes
SHA-256: 3a2fb5cffaf0909c1eee77375e3e06bb7fec714892a61ce82057babb05dfff0a

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