Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ee035b1fea8eff1…

MALICIOUS

PDF

84.5 KB Created: 2021-09-16 09:20:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4d4e18428fcce74e02b2622d6b65ca53 SHA-1: cc779b68ef565c8143c436c247f072119791520f SHA-256: 8ee035b1fea8eff1daa114b5d3adb92ffd71156ecb24a74b76c18e705574eac0
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, likely to obscure the true destination. The 'SE_CALLBACK_LURE' heuristic strongly suggests the document's purpose is to trick the user into calling a malicious phone number, a common tactic in tech-support scams and callback phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://archism.ru/uplcv?utm_term=voice+changer+android+pubg PDF link annotation
    • http://hanabi-la.com/uploads/files/68342432457.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/wetunebijufibewizow.pdfIn PDF document text
    • http://tucsokszekszard.hu/images/news/file/toduvemuzojemewa.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613eda57adc05---misera.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/39113599643.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/patuwomulul.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1613853f5898ae---88580013092.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/gasadofejosokonudo.pdfIn PDF document text
    • http://adveotec.com/img/file/59599966807.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/tibav.pdfIn PDF document text
    • http://upnbkk.com/file_media/file_image/file/fikaferosunudajo.pdfIn PDF document text
    • http://gomientrung.vn/uploads/image/files/xavoxegugutixagizopidut.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/xikabobimonakipavazuwubi.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/2105136439.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16139b8368eb2e---65288313593.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/xipapibeve.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/saviguvikapakoza.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/kewilijab.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/76650017871.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/36329611497.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142dea781afc---20520112543.pdfIn PDF document text
    • http://biosystech.com/pdsFck/file/xejajezikokebima.pdfIn PDF document text
    • https://remont-bez-zabot.ru/files/file/birexoxaruxixubirokifi.pdfIn PDF document text
    • http://wjcopy.com/upload/files/keledopidile.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/omv0u8h3196leu02l8rhtj4tgm/81621066430.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613905a0253a6---ravarajuzafapilo.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_off0000e601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE601 17860 bytes
SHA-256: 85aa7e706d81f584b78cf627b1e29b8d7d424f250837e28f2073f7bb289e9c18
font_01_sfnt_off00011433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11433 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C4A 10692 bytes
SHA-256: 9860442c9f48f4e2198f0ab480d955f800fecba17559442f1cfd161390bf17b4

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