Malicious PDF — malware analysis report

Static analysis result for SHA-256 965bd6e92a130ddf…

MALICIOUS

PDF

74.0 KB Created: 2021-09-08 03:55:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3ea1102a1170726861975cec8307f399 SHA-1: 86b336711a0000287bf9bf0816c4722167aa17d4 SHA-256: 965bd6e92a130ddfce1c59a704c9e39e58716c5c4688fd00e9d4e86f504b9bd4
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple domains, many of which are associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://kzlo.pl/fotki/fotki/file/panudijadukuluwuze.pdf In PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/fabibixuxetepujogupinabob.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/xuwagetewitibuvom.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/533c7e4141fc7ba6a21b9bd8910f5c0b/70744057098.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/77291219222.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/65052930516.pdfIn PDF document text
    • http://huimao.com/upload/23719567385.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16092918891671---61435566446.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160a68ca28a429---76412100792.pdfIn PDF document text
    • http://nhatrangpalace.net/app/webroot/upload/files/rewujexubumisu.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/56cc70ea619d73a8c9e765bb64cda6c2/88802475820.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/mumovus.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4e89ab948---lifumurerafalawenavo.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e170b3d44---32288115929.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/25327536325.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/c1qkob10ujtt31hp4vf727ld9c/wevowava.pdfIn PDF document text
    • https://marijina-romarska-pot.si/userfiles/file/gekimorudan.pdfIn PDF document text
    • http://chromoink.com/updates/file/jimidimufe.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/74667789222.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/6bcbbd8dee294dec522dec49096698d9/nares.pdfIn PDF document text
    • https://dienlanhbachkhoa.info/upload/files/nirowikevogusuna.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/nuj9pr9ajuh7trkvul5oks8q8u/kibibup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=learning+drawing+books+pdfPDF link annotation
    • 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_off0000bf6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF6E 16388 bytes
SHA-256: a8ee38f9cd831d37a986fdd1f2d70d6397d86c776cea2ec615e0f55efbe462e0
font_01_sfnt_off0000e99c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99C 10804 bytes
SHA-256: 85ac2a4b4fa67876b5a4ef3122bd11e2b176a8e07c302b9c30a6e0fe79a12325
font_02_sfnt_off0001023c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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