Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f118e60dd4b3693…

MALICIOUS

PDF

80.1 KB Created: 2021-08-30 19:19:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8699a878fb898f98d61205c1225d702b SHA-1: db3050172cbdf29fad71cf984e5249d8042fec3c SHA-256: 8f118e60dd4b369328d8c420699886d9f72cd34a3dcd25c828ce83d4909cdfb7
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The primary attack pattern involves directing users to external URLs hosted on these compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=quantitative+research+in+psychology PDF link annotation
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a1073064050---zawuwakela.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/0c1c83cb4a315a61ff44267f04565be8/pepopijamobipo.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/pasususemided.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/vinerulolamilipoxubataba.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/81bd9b36f96dc0fbc47b085fbbb1fc79/fegipovixitaguxegifiwoli.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f611ca5c44---ravusarimuz.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd21d6bd9f---lagazal.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5a3048b0c.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/2fk3h5d987l4ior5kus96dcl6e/memazede.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/18865129823.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/0fb9077efcda45690e4d41814470e96a/61158154467.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/48497108179.pdfIn PDF document text
    • http://maybomnuocdanang.com/uploads/image/files/mimugox.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/aa0549ff8108bc83befe5a9e67905a5b/vebusivopokomigufopukom.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078f41fa9649---xadugepukapogeripisunafas.pdfIn PDF document text
    • http://surtek.biz/image/files/20150104_124631.pdfIn PDF document text
    • http://anupbolivia.com/images/files/93484856679.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/tekagedifugumidafosoro.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/rixamiguge.pdfIn PDF document text
    • http://score1forspencer.com/clients/4/45/4587145e2679cb7673d0e21b436e5c25/File/78142034076.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610bd94a08afa---vodokoxifixafaxon.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/saslrgnleddcttsgd9anl8sfro/suwematemaxub.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/pevujovekolumib.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_off0000d102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD102 17960 bytes
SHA-256: 13ae206b0264079e5623d6502d8b61dc29c454a445aecfb1d6f522d77368d4cc
font_01_sfnt_off0000ff7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7D 10992 bytes
SHA-256: 582b19f78a2a219fd2ec5bf8dd135403fde93a9cf38def7b9c98dcf59f45432d
font_02_sfnt_off00011922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11922 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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