Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4f7f29f70ef299c…

MALICIOUS

PDF

73.0 KB Created: 2021-09-06 09:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0331b895fb2c119c8e01669841366420 SHA-1: d5e1d64fa7b12d34b56faf47f8583401423adc25 SHA-256: c4f7f29f70ef299c3402829bba58330f3cebcb5d7571f15f0278de8ddd098c8e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The presence of numerous links, many pointing to compromised CMS upload directories and disposable hosting, indicates a link farm designed to redirect users. While no scripts were explicitly extracted, the nature of the link farm suggests an attempt to lure users to phishing or malware distribution sites, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://associazionedynamica.it/uploads/file/38123423078.pdf In PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a589e06dfac---sewisevovesuvegesago.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/50617734320.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///majija.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/u1pv4ss3vg24ssg844on5ch77j/43335693198.pdfIn PDF document text
    • https://5uempat.com/contents/files/19330227081.pdfIn PDF document text
    • https://keongracun.org/contents//files/gogatajuji.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/65706315236.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/63c6ac2422a09c52dd8494517ca2264e/mofoga.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073526e45234---18303450986.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d8da1784c29---78054659864.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/55645239451.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210610014501_4nbxij.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/a2fsvpi8hg5kto125pin7ea9mb/budamovosirutu.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/a83fa7c48369d09641c5448ad22fbfd9/4816784633.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/97786279849.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/35302894780.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609875850dfb5---69217834194.pdfIn PDF document text
    • http://msmzizkov.cz/data/dokumenty/wadotumidigip.pdfIn PDF document text
    • https://pontus-sd.eu/uploads/file/39201015885.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/jujatimaz.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607009808fb12---24910726225.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/553c8346570ef98d7c38049efba5402f/zimibojabidibosu.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/3e75a4a23e265e6e8e23e1e0767668fd/wizimu.pdfIn PDF document text
    • http://dfh-consulting.com/userfiles/file/15244843592.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=great+grammar+practice+grade+5+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_off0000bb8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB8E 16436 bytes
SHA-256: 1d98484990b8f053d6681f245c380d507f2332dd80380b3abb285e9a7a993386
font_01_sfnt_off0000e5a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBB 10696 bytes
SHA-256: 0122dcfad009408a637fa0ef122982ae0d58df73030f1c97ea887a07ed3d4b86

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