Malicious PDF — malware analysis report

Static analysis result for SHA-256 149172e756ec30f6…

MALICIOUS

PDF

104.5 KB Created: 2021-06-30 06:43:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6170e3d7bed3b717e813aa360ac98537 SHA-1: e311f7df546bd2e6b75a7c6395929308d59292ab SHA-256: 149172e756ec30f6837aa6f9ff12b7a3730277f052ea39eb83a0db6697a86406
156 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall detection profile strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1606f013214e9d---84412699139.pdf
    • http://architects-desk.com/uploadsfile/72838197598.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/cct6os8a2cvc0h7ioacqq1mh04/safem.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a647515d800---51717256076.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c036289461---zalixepusowag.pdf
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/wosesikagaviwim.pdf
    • http://bortran.com/upload/image/file/20210623034318.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/52a546aa314b1b387e50ee67adbc1680/25308201571.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b989074a3---sifomuxoponebibisa.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607294a1a30e1---wenepulud.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609d7d3ee11e6---soxekejifi.pdf
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087e29a916cc---53159790620.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/4ec930d49433376514d0f4aaed26f9ce/60556760636.pdf
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/4158216b20cd99b7a0cb00a4b1f4aa3c/2343988646.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607331b0aba5e---nuputafokalivigafi.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/a41f69f658aaabb30f63611841b2e600/16223425342.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c3701bf209c---pikaguvokotit.pdf
    • http://akcjonariusz.com/UserFiles/file/ladofamujunodim.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/f7b61e3fe9e7ab2579a6a5342c4f85b6/rekuvupurigewifezazepo.pdf
    • http://dentherapia.hu/files/file/kuvijerezowivav.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4a914e19c---89238594382.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=raphael+warnock+medicare+for+all
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000134e9.bin
2c9ba6338c73987ed6b3251a2ba7f5e6368a380ff0c340627d10a4299dd1242f
pdf-font-stream PDF embedded font (sfnt) at offset 0x134E9 17332 bytes
font_01_sfnt_off0001628b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1628B 16792 bytes
font_02_sfnt_off00017aa2.bin
ef7cd45eab4566008406224b20734e7328f403ce3375fd8acc14debc03fcb541
pdf-font-stream PDF embedded font (sfnt) at offset 0x17AA2 10844 bytes