Malicious PDF — malware analysis report

Static analysis result for SHA-256 44c65545df4cbe25…

MALICIOUS

PDF

100.5 KB Created: 2021-08-11 23:21:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9dbe6ca062cd8b609ce586170fd1aad6 SHA-1: 74fc4a703f1747493ae2bffeb42b9f2de2b1d7af SHA-256: 44c65545df4cbe2506523fa255ca995890c7ec1ceca94284e6a0f43fff453a1e
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 and disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://nandeestationery.com/userfiles/files/warazimofo.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dda58b6f06---xufogexe.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160700b5e4468f---21984328628.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16093b78f67295---raguka.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160864926b32fb---16049673127.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6512db006b---xumuwaruvudixivalopelowil.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea591aae04---mofejasaru.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/td38orekaf5oftg1qo9holllp4/dajifukowubuzenegiwikit.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/v16iosoj265jd5kl5jetqt8reo/todovos.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/1b573d9453af89f492acf9c65d439eca/89516342952.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/dupurelikus.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/9elgijn757tguvishdl4s7b2qb/fewadire.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/jirowojonobapum.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/kijivigizuvovezow.pdfIn PDF document text
    • https://noddy.nu/images/file/vafijurenevovajawufigenex.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16073c0ab447da---vuwumawitorolurutunijak.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/112faff96146882a795056c825561855/79793969205.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/29929280060.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/82201587450.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/63c6a9d6efe36b3218d0be3535379374/revugelore.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607af0fd3ee9f---89780747091.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/mhko4it9d7rbvoci5rek3a1vge/60791503254.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/31803745750.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=examen+extraordinario+de+matematicas+1+preparatoriaPDF 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_off00011ec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC3 10764 bytes
SHA-256: 1122f18ec971504865143e2dd979d32b13071a731b353d363385a618fb695037
font_01_sfnt_off00013791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13791 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014fa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FA3 19552 bytes
SHA-256: 13a63518eba547dfc7fdc13647347f3ba3a78b582cac4da878c1c521551cdf75

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