Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5ba5a9a38aeef67…

MALICIOUS

PDF

87.9 KB Created: 2021-08-07 04:12:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b4bb2c69ae8f103ea650be990e6890fd SHA-1: d682143e1ff9ad67d16f7baf285c05dd3e1b61ab SHA-256: d5ba5a9a38aeef6734fbe85455e0ec0262e429ff615e5fc04863bbf6562464e2
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 CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://afghansolar.com/userfiles/file/16778718729.pdf In PDF document text
    • http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/63701259337.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/gasomu.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160892a7bc4d95---rasiwujivowojo.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083845164253---86406640117.pdfIn PDF document text
    • http://bociany.sk/media/file/11498204144.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/35059145836.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/kaxiwuniweranajuz.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717dd3c1cd3---96974994324.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/nupivajux.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/zuvojopera.pdfIn PDF document text
    • http://www.scsi.coop/wp-content/plugins/super-forms/uploads/php/files/9d6b20b8a747993ecb1e37e5d16aac92/tikanuxozamukova.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/4971603048.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/6974729307.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/93424324502.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/gajitifuzubofobuge.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/87720832520.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/0fb0367f521ea029cbd23c71e556d381/76915479004.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/72384299413.pdfIn PDF document text
    • http://lokale-uzytkowe.pl/uploades/fckeditorfile/zamutafomasulufulogekosol.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe24a8a0e2---pikubi.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/xexesujomadej.pdfIn PDF document text
    • https://loctra.net/userfiles/file/18135284101.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=factory+reset+iphone+6+restrictions+passcodePDF 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_off0000f49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49F 10824 bytes
SHA-256: d5991626c3332db2269b9898c4d4529b144d7ed7c49bcacab370d2d7ba3b1c35
font_01_sfnt_off00010d8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8D 16648 bytes
SHA-256: 1e8cdcfc9132145cb7fa0391f7df4cdf669b112e775fa7e061856de7f4ff277a
font_02_sfnt_off00013915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13915 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1