Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec309ab515417b27…

MALICIOUS

PDF

72.6 KB Created: 2021-09-25 17:47:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: efcb1c33178308f5df90baa81fdd8d4f SHA-1: 26c6f41408050f1b209983ec8403daa43b272ced SHA-256: ec309ab515417b27df4f33f431a1473a21bd85f173fe734528c39d6bb7cb6067
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, indicative of a link farm designed to lure victims. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links are sufficient to infer a malicious attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://autonoleggioassereto.com/file/kemamusazurinasusigu.pdf In PDF document text
    • https://ikansambel.com/contents/files/61774800825.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/xirumenivujasemewotuxeba.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16145163c60073---zilekesomigamejuke.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/db1ue1iicbvmok1ou7ukhismv4/nukotizas.pdfIn PDF document text
    • http://basketaci.cz/UserFiles/File/lirexop.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/24620695903.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/zozurura.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202109011412208352.pdfIn PDF document text
    • https://xnkvinatimex.com/uploads/files/74553710679.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613980881aa77---gadusugojanowiwuwaw.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/pomimibawaxupaxav.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16149184d19b5c---pozilemovuguf.pdfIn PDF document text
    • http://vincentianssjp.com/userfiles/file/92899503580.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/79793031761.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/61751621955.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/94864556409.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/kudupepexijiki.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/54613368715.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/788a38c1cf1b83476b31a177ad1ea903/suvod.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/77223995513.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/xifupanugivoji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=batterij+test+androidPDF 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_off0000b4f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F3 18508 bytes
SHA-256: 8f6619a138b053824fed0167db5013a7c919a04fa5b8549a1a600e2a6c0331fb
font_01_sfnt_off0000e39a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB1 10376 bytes
SHA-256: 2311a55c4df0e37242cceaa862d14394b0cf63c8424a7ca527323f13e3c8893d