Malicious PDF — malware analysis report

Static analysis result for SHA-256 35ad28514813a184…

MALICIOUS

PDF

88.9 KB Created: 2021-09-16 09:42:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 47c993e7d55f2fdd01cedd8cae1ea5fd SHA-1: 156101b662d635b156199b46da45315f12bfaaf6 SHA-256: 35ad28514813a184dcc7dec3a5a9865cb42a4212e55fa5ef3bf39b0bed956505
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://allytemp.ru/uplcv?utm_term=jason+bourne+full+movie+watch+online PDF link annotation
    • http://timandlor.com/userfiles/file/46159422421.pdfIn PDF document text
    • http://szerecsen.hu/editor_up/bizegipowugoropulifuguli.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/tiluwobo.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/59108436682.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210903043335127673ifm85c.pdfIn PDF document text
    • http://tuvantindat.com/uploads/2021-09-06/images/files/77198249424.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161324e8d8be84---bafabuvinipum.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/70731651548.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/nemulepuzisonenojifunu.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/bifezamivov.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16141caf01a61c---rizinimakulakodu.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/93905040945.pdfIn PDF document text
    • http://synphabase.ch/upload/file/97265920634.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/bifevavivuvirojo.pdfIn PDF document text
    • http://hausdergesundheit.net/userfiles/files/giluk.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161387e0529d77---10370325289.pdfIn PDF document text
    • https://projetovm.com/uploads/files/38024462324.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/7265828122.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/97377858309.pdfIn PDF document text
    • http://dichvumucin.com/upload/ckupload/files/89586748692.pdfIn PDF document text
    • http://astmasme.com/userData/board/file/pagowitarikoxowofilepuvi.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/v2gjg2npap46h2bd7r7cfv8qv1/firatokaboxopuv.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/pufixuzefimowawegulijapa.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/46459100451.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/58707714063.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_off0000f744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF744 10984 bytes
SHA-256: a897c359fb2123ed8e600fdbe9a6fa641275fad277a77ce5b436e9d83c6af155
font_01_sfnt_off000110a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A8 17596 bytes
SHA-256: 91ece05e0da0160e5bf70c4926501cdaf595e0d5598e68e8ccdd987aba6c7e6f
font_02_sfnt_off00013de3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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