Malicious PDF — malware analysis report

Static analysis result for SHA-256 c32ffe06efe9e919…

MALICIOUS

PDF

100.7 KB Created: 2021-07-18 12:18:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 20f41afa71a002a5987631194f2052a7 SHA-1: 8925e4d458e1ba5aaf5a7a7b7b04f3af3595b073 SHA-256: c32ffe06efe9e9195b86f34e77a4ca9c5481a521c66cfdb101bf3bbac19bd442
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, characteristic of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites via these embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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 https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/cpspk186rii0ho0iff2t4stjg7/75502251774.pdf In PDF document text
    • http://busankid.com/webfiles/board/file///27185249562.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/gaxakelumogajopase.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/b2c4cf51ac9ad7815d92954c2ab2e2dc/65732488905.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/hfi62799g6v9vph1n4oa6eu645/54407961895.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/72260438623.pdfIn PDF document text
    • http://www.asslar.de/downloads/65870504303.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/wogivonikuz.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/93112927461.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce98ae1265---95285138626.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160889135b9004---jagasag.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/org03kf4362dnh6mc2h058hoo8/sijutesif.pdfIn PDF document text
    • http://ruoumoc.com/upload/files/demimidajopujunifitow.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/85036095242.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16087816acf102---20331299356.pdfIn PDF document text
    • http://penney1970.com/clients/7/74/747debde904cce1d9d58e62e9103e361/File/gojozadukani.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ecacba4087d---63141204029.pdfIn PDF document text
    • http://spearmanhsreunion.org/clients/e/e1/e1754705b4c076d7cd520c5e9e79ed07/File/ruzuxitadat.pdfIn PDF document text
    • http://cuatudongsaigon.vn/uploads/files/65158228554.pdfIn PDF document text
    • http://614move.com/clients/4890/File/jogiv.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/ruvekatewategig.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad71a6b3ed7---kemeluzinurinuledibinaje.pdfIn PDF document text
    • http://newfieldclassof1982.com/clients/6/69/69e49ffade321d977af769e13f9f004b/File/22392883304.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/81fpvppb5bag6l2m05rtkk8pkv/mibabulaj.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c617df14400---99148070420.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=megan+meade%27s+guide+to+the+mcgowanPDF 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_off00012519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12519 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013d30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D30 10884 bytes
SHA-256: 46e810b89e10cac3c3a34dd83614afd25eedf9fb0a422622cd620f604e51e7c9
font_02_sfnt_off00015616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15616 17400 bytes
SHA-256: 6ac5d13931c333a612f3afc06b09ed650ae739bdf2be7b8fa668d66e11b02157