Malicious PDF — malware analysis report

Static analysis result for SHA-256 89a147e8ce2bb0c5…

MALICIOUS

PDF

80.5 KB Created: 2021-09-04 19:02:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 82c4884944faffea3269126987265b9d SHA-1: 236c044e0bde4fd01fe82db1d1923cea52d41e4d SHA-256: 89a147e8ce2bb0c5ac16d20e242c89d36a0ef55f20a70e1e7b921adee54d0fae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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=rar+converter+to+pdf+free+online PDF link annotation
    • http://musicpark-live.de/userfiles/file/wodefanokewexi.pdfIn PDF document text
    • https://medpressa.ru/files/file/gekeboxowiboxexosigisew.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/12144593529.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/xaxafo.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/litom.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/014f4107a70f7964c3c69fe67b854421/79426094400.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/3046420520.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/kikamamalikakile.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/watajizovujirusoluke.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/xawakikudokasofolosat.pdfIn PDF document text
    • https://proartgaleria.hu/files/files/nolabaxipaj.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/7aa7554043f134a3504765996053dbc1/fefemetezilelobamaximov.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094597d917a2---43969371954.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/sikoxu.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303526087f4---fagusofufabelu.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b811fb685b---37523143200.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec5211b10ca---45400839574.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/buneri.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/weverutonofeleluwaxu.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/161002f05b34d6---79252950152.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/5184dbo4cg2q368sjk6qvdni51/nomekogojipozunolus.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/41507350192.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_off0000d4f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F2 10556 bytes
SHA-256: 7062f9cc38d2442b998994c97bf28c41750c4d37b89fd9ab1c6d155d0754cf2d
font_01_sfnt_off0000ed26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED26 18136 bytes
SHA-256: 59df4c9c4d4e6fb96be1a6bcbcca0ab3d864ff14b3c389627e1379bf904bd1d5
font_02_sfnt_off00011c1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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