Malicious PDF — malware analysis report

Static analysis result for SHA-256 82c8c3fe89a997ba…

MALICIOUS

PDF

82.1 KB Created: 2021-09-12 20:09:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4779aeaad9ba3989047ff27954552511 SHA-1: 1af6092b776a538f88a85216bf30481aa21b2d5b SHA-256: 82c8c3fe89a997bac7345eccbfbd8f201c800e8500adf6f79bef94369831bb4e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate an attempt to deliver a malicious payload or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://philabc.ru/uplcv?utm_term=wrestling+revolution+hacked+version PDF link annotation
    • https://skyzoan.com/cake/beta/userfiles/file/93365145772.pdfIn PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/betarixugirawuzawededet.pdfIn PDF document text
    • https://huuphongplastic.vn/uploads/images/files/wunomepalazujoxolatijaja.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/55574303702.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/54950240668.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/melqf7ol5lmtdfu3gal3pr4u21/86225812164.pdfIn PDF document text
    • http://yanartekstil.com/firma/files/narufisatirivovedaz.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/3022811139.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/mosusodilivinewisuluvuxap.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fedd8e1df2---23221261034.pdfIn PDF document text
    • http://eapver.com/upload/ckimg/files/202109120306259379.pdfIn PDF document text
    • http://wonderful-foods.net/userfiles/file/lulepip.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/61647386718.pdfIn PDF document text
    • http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1630756316.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/963700c09ace766b3401ef56cb6fd439/levukewoviwabojawikub.pdfIn PDF document text
    • https://zenit-npk.ru/files/file/vatezukozolanuximufe.pdfIn PDF document text
    • https://zahrek.com/userfiles/file/78874550703.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/vupoginutimixuriva.pdfIn PDF document text
    • https://penal-garazh.ru/files/zuxepozexezoxugitutugude.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612edc8206d95---detarevubetakew.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136997006422---71891003924.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/dozarazasadezoxeke.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/6c6b9c15b40dcbebb279880d5259081c/94646814681.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/jepapivosizaj.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_off0000de98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AA 16708 bytes
SHA-256: f107160967e966bb353b8e974aa3ef23e92023103ba3ccd5b834c046ff6b58f3
font_02_sfnt_off00012186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12186 10900 bytes
SHA-256: 0d35165d3bf9262d27de5a67f5cb2b8788d094f6df880bed41d0df6cabd432c6

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