Malicious PDF — malware analysis report

Static analysis result for SHA-256 09f0e04c934a19d5…

MALICIOUS

PDF

81.8 KB Created: 2021-08-17 06:09:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 28183bad2e5489597920ff83be34b5d4 SHA-1: 3bf7f8f8bee40b1372b3f8a1a40374e3366de922 SHA-256: 09f0e04c934a19d56b44f04b28a9332d191fd8f0f3cff4648d7bd22258c4f499
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains, likely intended to redirect users to malicious content or facilitate further exploitation. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the nature of the document as a collection of links designed for deceptive purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://inwebjor.ru/uplcv?utm_term=libro+de+matematicas+tercer+grado+volumen+2+para+el+maestro PDF link annotation
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/aac6f2d4e5cf838c6be33f2980904036/luvesanob.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210621202602_5npxgb.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/601517e779010cceaef57d16053716eb/pisuseworazugu.pdfIn PDF document text
    • http://sumnerclassof1976.com/clients/4/49/49b54eafcc86ae0c30eb104ab8b91c7c/File/19920219128.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/2a280bab3db5aef61d1e28cae61b1289/letis.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/5l2q07tr4m3t0vt59dc3qfpo34/71896035352.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/51b383d594e3e69fbd1de24b5ad5d9ab/73084573471.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/76142177688.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af44831ee7---72811171751.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/18384914217.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/vuxurijize.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c0fd7fdc562---95723438356.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/xunefanokodejekitijuvixu.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2d410d775---farepixifove.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/1k4omrphosdp99h5ckju2gk8fs/vewit.pdfIn PDF document text
    • http://escqatar.com/uploads/userfiles/file/file/22898437156.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/81170535585.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/fe5043a019ab350679a253fd565b6f78/31188679366.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/02rcc5e26fu66eces1rgr5t08f/nojulivepixurikogefi.pdfIn PDF document text
    • http://ongnuocdenhat.com/upload/files/72616809922.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/goguvu.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/kodudijamosixala.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/wesivuwof.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/mawukexafumaxifikajidami.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_off0000d9e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E5 11240 bytes
SHA-256: 878dce3ce9084345424e7ba3fddf631e407efdf401e62efa4d24eca302e1da6c
font_01_sfnt_off0000f3e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF9 17092 bytes
SHA-256: e74000fe8a335dc9dbc3f7bf5b099222840f4ead07c09d3c1792a1c6fd9e85c1

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