Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dec38204ac8a3fc…

MALICIOUS

PDF

94.8 KB Created: 2021-07-31 05:43:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7c1d516363abb984e0049e9a324db16d SHA-1: d08904f4a07e4def5ae1f1e50bc9f22ee74e9fa0 SHA-256: 3dec38204ac8a3fcdb54bfed3423c33831f1f2106e8569b86fdd7be463a7ded6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting an attempt to distribute malicious content or conduct phishing. No scripts were extracted, but the presence of numerous external links indicates a strong intent to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://oniceh.ru/uplcv?utm_term=sentence+with+adverbial+phrase PDF link annotation
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16073dce9da568---23353832173.pdfIn PDF document text
    • http://janatalnajaf.com/basefile/janatalnajafcom/files/xodovama.pdfIn PDF document text
    • http://asfalon.com/__files/file/maxukon.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acaaf969073---miseripometetumamu.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/899c633a9e5e693cb1682dcfabf7aefa/98431709536.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/fasarofepanireka.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/tomirobebotibigawifewavij.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a086fb35e6f---77956282944.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/pau4p7bs07qq69ghmg9df11k78/39066517172.pdfIn PDF document text
    • http://highlandhighclassof1962.com/clients/c/c3/c330a44b04b080977bf299ea430a317d/File/46312788262.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/vibaropinoramidu.pdfIn PDF document text
    • http://mamnonlittlesun.com/upload/files/50233542765.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160c4420bc3f54---99661951429.pdfIn PDF document text
    • https://pasargadhotelsholding.com/cache/fck_files/file/75389571206.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/fuselepujoperako.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d1a5bef3eb7---13387560372.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210605_065256.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/gikowofanuvapixuwubosem.pdfIn PDF document text
    • http://richfield1960.com/clients/865265/File/10059764314.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/siwodebitaxi.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/zurodokixufixag.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/43730591877.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_off00010dda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDA 10860 bytes
SHA-256: 5dc70de0451c75502ec16afddf2cf61232808359676f2ad493f7db82b65aae79
font_01_sfnt_off000126b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EC3 17840 bytes
SHA-256: 90f4647b208968fe19fb966b27265ba9285e27d156b96947de6774cd799fd31a

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