Malicious PDF — malware analysis report

Static analysis result for SHA-256 763ac44846fb1a12…

MALICIOUS

PDF

86.9 KB Created: 2021-07-02 18:41:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6483b56474de33f2f7bde15bcbe114ca SHA-1: 38ba59693ce8470e8e5b1f6c9377295a9211ded5 SHA-256: 763ac44846fb1a121be0d6f15df18494f712d6793f40f9f8efb30943cb1b0df1
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1027 Obfuscated Files or Information T1553.005 Antivirus Escape

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains multiple heuristics indicating it's a link farm designed to host malicious content, with one URL specifically mentioning 'office activator for mac'. The document also contains instructions to disable security software and provides a password for an archive, strongly suggesting a phishing or malware delivery attempt. The presence of these elements indicates a likely attempt to trick the user into downloading and executing a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://garglob.ru/uplcv?utm_term=office+activator+for+mac PDF link annotation
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc344e7496---bugijixolewemefurib.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/8uud4tmr7av6op869deq32h9d2/rixonagenivaku.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9178dc9ea---12657537970.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d742a9a46---31159332254.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/39458538852.pdfIn PDF document text
    • https://banghenails.com/upload/file/65126929795.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16094984d2af2d---78396481109.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/d51d5426918fe7a494f20345563d9e9b/mawugabofixevow.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d71b983c32e---lokawuxa.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/3430515199.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9659364523---lizitopivemezufigabe.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/vorov.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b14537afa8e---jusez.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/00b8b2e22e5393372c4eb74f81a00a95/18086144282.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/libidonowatiwujenoxafes.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607f735746831---dorenejozubotabo.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160791df1f2148---55507455818.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/sewosirapupu.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/kikigewitafuximaxebisogap.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/41204105912.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/jt8ekdnc2spfljlpnt9t4lhq7e/43335998931.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160707d6091116---mebegoxovadoki.pdfIn PDF document text
    • https://fanaf.comarticle_ressources/file/totimuradipetakexatasode.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160797233ab0fc---85857887849.pdfIn PDF document text
    • http://sgpeo.pl/users//file/xumuvikix.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/purazudexirazazevevel.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_off0000f214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF214 17244 bytes
SHA-256: da48a93197074b95b4767c4519b539b9fe8c2a920b2add3b0bd393b289b9ce1a
font_01_sfnt_off00011ee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE4 10268 bytes
SHA-256: 993b46af7f25f796110eb5ebe9a6af975ae3f40f8e77b59dd75abedbb6cf750d
font_02_sfnt_off00013615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13615 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1