Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b64a3e784e2a0c9…

MALICIOUS

PDF

98.0 KB Created: 2021-09-05 01:08:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1cdf3812ecc84fa61a0a03c672db6e8c SHA-1: 1113dd6918a394d34fa1225a4724d0ece166c267 SHA-256: 3b64a3e784e2a0c9b2eb8c12b077611e075b8a26cdea0e1e1b91f1fbcae08b07
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of link farms, indicating a malicious intent to manipulate search engine results or direct users to potentially harmful content. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing or trojan threat.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://mobilahomedesign.com/userfiles/files/lobeto.pdf In PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090502100073499.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce70ad830c---kuxikiwaji.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/88352951008.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/68582229028.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/raxazujamezepopesot.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105c39001598---71940384927.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/92171605804.pdfIn PDF document text
    • http://www.farmaciavictoriayjmleon.com/userfiles/files/kileniretemu.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/38630771085.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be413ea60f3---goraxazowoxijaranizinifi.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/ht8p9i8tdahpb5e6k6g58g3dpt/92676890026.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/73522005800.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/begajepikekozevufege.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/739dd63a7fbcdb655d9d76f3e8354b09/59357075650.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/17212169591.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/pizaponuvipufusupeli.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/donimekananugamopu.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/saron.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/sepopi.pdfIn PDF document text
    • https://www.micd.edu.np/ckfinder/userfiles/files/44050900795.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/korakixokudugiv.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/75809193243.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=algebraic+fractions+worksheet+year+8PDF 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_off0001154e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1154E 19172 bytes
SHA-256: c0220e5d8713fce41fe8d3c40a44bdc6a0910a139345dd9835681259a12fb038
font_01_sfnt_off000147d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015ff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FF0 11236 bytes
SHA-256: 0fee20f5a65db71bee4a957c91327b7aded50efa5a214ded46f49ecd85009e91