Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc55e4d537182ce4…

MALICIOUS

PDF

80.4 KB Created: 2021-09-14 08:38:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 24bc332bbd46aed11b22e91b947d6f0d SHA-1: bb55b353e8098bcfcdd95746fd376f4b67721cf7 SHA-256: bc55e4d537182ce40b2741615c44630fb6f302145edbc9e9f3d94e05e4752544
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious or phishing content. While no scripts were directly extracted, the nature of the embedded URLs and the heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crysiq.ru/uplcv?utm_term=how+to+restrict+access+to+apps+on+android PDF link annotation
    • https://happycondo.leaddeehub.com/userfiles/files/65152874720.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613db923276b0---nejuludagopumoduwaga.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161318945f2f41---tarugazutupalodefoterol.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393947d0414---kaluxokirakupupirarur.pdfIn PDF document text
    • http://vina2002.com/uploads/files/birevaxi.pdfIn PDF document text
    • http://gapp.fr/medias/files/40340918051.pdfIn PDF document text
    • https://aymexco.ro/ckfinder/userfiles/files/34298952896.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210914075524827.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/lomewagudiwev.pdfIn PDF document text
    • http://cutskytools.com/d/files/rusokidatasonolebopu.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/161384952658f3---bexugu.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/76246405895.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/66848054400.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/selimi.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/8821952262.pdfIn PDF document text
    • http://photo-ostrov.com/ckfinder/userfiles/files/tekulu.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/libukixibuzosawero.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/batatepul.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210902011331.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/88265315083.pdfIn PDF document text
    • http://jiehuist.com/userfiles/files/87727102283.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/zuwoxifusebebu.pdfIn PDF document text
    • http://d-a-s.cn/userfiles/file/molezeridigokaxat.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/3573455328.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/ligoxabu.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_off0000d555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD555 17864 bytes
SHA-256: 123c97e5bd2d9490ef652259f8dda9c3e3810edb3e25a1591c12b5647d509c4e
font_01_sfnt_off00010388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10388 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B9F 10536 bytes
SHA-256: c18d4974542636aacb6dabb84222fd015a0f38cb8b6b2f555ee2603e0e72283d

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