Malicious PDF — malware analysis report

Static analysis result for SHA-256 99a4cf2e21a842d7…

MALICIOUS

PDF

71.9 KB Created: 2021-09-17 12:57:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 25f83658d97cc7a80be7d2f846ab2f33 SHA-1: 7c65b1ca0a08f5cfc4d180e4c23eb2333c9ae77b SHA-256: 99a4cf2e21a842d75462763ac73d67f5e453d000e53b0ad6ada09bf6f1e0f3ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple disposable hosting sites, a common tactic for distributing malware or phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to trick users into downloading further malicious content, likely through a phishing or scam pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://asja.ua/userfiles/file/vikeborijamejevovurobep.pdf In PDF document text
    • http://jinyezi.cn/upload/sotonoda.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/93075060633.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/73320766179.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/43643399971.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/gamezefewuzitubomata.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/10421265130.pdfIn PDF document text
    • http://ijfbn.com/editor_up/zodakow.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/189ce61192d8f28a69970935484f15bc/nokizigafonidujo.pdfIn PDF document text
    • http://addon-colsman.somantec.net/ckfinder/userfiles/files/bebabaxofol.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/25817052607.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/27134434653.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210906_4586667EF22A9C13.pdfIn PDF document text
    • https://lesura.net/userfiles/file/8156735852.pdfIn PDF document text
    • https://cmoretv.com/userfiles/27679938412.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/pasireralibexizuzabekusa.pdfIn PDF document text
    • http://chokysitohang.com/Uploads/userfiles/files/wanipasuwaxa.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4557971d9---39223933583.pdfIn PDF document text
    • https://dbhattacharjee.com/ckfinder/userfiles/files/93515658383.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b9cc010fc93e1c3634de2959b84ba50a/37506907728.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141aa1836f1d---mubolisidijopaxalazuda.pdfIn PDF document text
    • https://astoraccessories.com/uploads/ckfinder/files/67783399342.pdfIn PDF document text
    • https://urology-andrology.com/userfiles/file/gadozin.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/10618139826.pdfIn PDF document text
    • https://nistd.in/userfiles/file/11970061425.pdfIn PDF document text
    • http://marketingnews.fr/images/file/17621896620.pdfIn PDF document text
    • http://voyagevietnamlaos.com/hinhanh/file/wujodenoduresoju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=download+gta+san+andreas+for+android+full+apk+freePDF 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_off0000b679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB679 16032 bytes
SHA-256: 71c1f001f6e9313fd563cf694fd32a99aada0633408f457f72f6a51dd5bab1d6
font_01_sfnt_off0000dfa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA3 10952 bytes
SHA-256: ef80feb776372860466d63fa6fa5e963ed862bb39cd1298aa54a6920efa0c4cf
font_02_sfnt_off0000f908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF908 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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