Malicious PDF — malware analysis report

Static analysis result for SHA-256 975956532a365b2a…

MALICIOUS

PDF

78.5 KB Created: 2021-09-24 19:56:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 45af61a19d4865e62061497bd37334e7 SHA-1: 213961ad8ee59d728059f8f3ef7b4e07cc66fcca SHA-256: 975956532a365b2a75fbf1049c6bd4371791341d1686284314fb819a82dcbf00
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised WordPress upload storage, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://smidgel.ru/uplcv?utm_term=ig+hoot+instagram+auto+liker PDF link annotation
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/8esfkemrgl8jihbtj1tqp667pp/baletasaderupofanerubine.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614bbe1ba471a---bamevobetuviwupabipave.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/61684693257.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/rijuviratubame.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16137c73a51c73---dabajofebowufig.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/xobamiritipa.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/zalogomomiwex.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/4854807297.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/71256308741.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/i9g1sug1hvtv39kkj3tum09rs5/20257261352.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/b0295ce26c95a49ab55db43cd5c1d406/79754997885.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/xunitovulisod.pdfIn PDF document text
    • http://honderhotel.com/UploadFiles/FCKeditor/20210918094600.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210921160551.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/17827778079.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/bp9kmev4l90lafhd7ntvg0as9p/viwumebomujawexiro.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/kikirikasitodezufi.pdfIn PDF document text
    • https://thuhuonglacquer.com/uploads/news_file/kagimum.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/61030063317.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/tamesane.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613f82508179a---pibelu.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16148a942bd1af---19356047600.pdfIn PDF document text
    • https://ijestr.com/ckfinder/userfiles/files/pozovabekaxiba.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_off0000c293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC293 10696 bytes
SHA-256: 3b75ba569e0c343038b8293e4eb43e524f841755b15e13f5c730aee79eb0717c
font_01_sfnt_off0000daf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF0 21820 bytes
SHA-256: a88f2abe55b144a7cd4b1c64bf4bfa92a4dac90a47b3066a2944fb1c3d10d299
font_02_sfnt_off000113ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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