Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bad734e4df6b75c…

MALICIOUS

PDF

91.2 KB Created: 2021-09-02 23:10:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ec9ea5c3c996b97775f28b96f94467d6 SHA-1: 82fe4fc1a28b369daa370e79b2328be1f2b14b6a SHA-256: 4bad734e4df6b75cd316b465d3e3f0e59f4bfef3c01876a3ffb858011b7504bd
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of external URIs and link farms points towards an attempt to lead the user to a malicious site, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/92d8d25b3f0943417d5b91f1d2ae686e/tumipefarasufab.pdf In PDF document text
    • http://maristaslardero.es/userfiles/file/9184911865.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/puvig.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/fef1fa288f417e77eefcdbce126fe2ec/wemel.pdfIn PDF document text
    • http://benly-carson.com/product/files/62328144787.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/nlm5f48n4cimnjddhj8hd4vkl0/beroveg.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084794088943---wapidij.pdfIn PDF document text
    • http://ychnjl.net/userfiles/files/kakukotekatowisuviv.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/mosasixesuxajigav.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/af408dae9bfdcbaea404c7cd7745ee6a/53138995902.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/kolanipawekomazozogesuj.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/jalamiboside.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/1d5778481614ec0f3a43a044c352889d/dadiwosikoluzopava.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607890f7d8f69---derudokolopezezemufi.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/a7700f835f5bdc5130de6c8cc5345ff5/2070037266.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/sobobekadilonirif.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/20345629699.pdfIn PDF document text
    • http://trendymamy.pl/userfiles/file/pijibowurobaziderasil.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/mivegovaduxade.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c06b5e3d82c---31624486903.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/defajufopepalofewoposuma.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16083f82157cc3---82867299109.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b590f44e296---sugetejuwelijuxe.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/hls828vviq6oblr3709jtp3fid/81585696454.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/gujurijazewavawu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=the+magician%27s+elephant+full+book+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_off0000fd61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD61 11296 bytes
SHA-256: 7cf9ba4da7ca54ba4695f15af51b112187e877abfb40509f7d9b178cac5238a9
font_01_sfnt_off00011761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11761 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F73 18288 bytes
SHA-256: cbcf3263d2f2b6c8685685cf2642b85a051131362747fd995d6cd72417537ee6