Malicious PDF — malware analysis report

Static analysis result for SHA-256 1849dd2a89b21a6c…

MALICIOUS

PDF

82.3 KB Created: 2021-07-19 04:35:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: b44d18c4d2753536d866f709d8036c20 SHA-1: 02ff75e0a674f6c0126fae740cfdbf8de228e687 SHA-256: 1849dd2a89b21a6c2f471e0cb90279c198ca73f41ad3e0007873f909e2282ecc
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier clean score 0.2133

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://atkarisuli.hu/userfiles/file/12136464654.pdf In PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/66bde8bdd50552de3272cfd893dbeafb/1386932010.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/3391757548.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e66ddf77ae4---85073958669.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d35ccb510e---wezotixezevodexit.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/19974316647.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607379964dbb2---16284991658.pdfIn PDF document text
    • http://sivam.pl/files/file/27778878926.pdfIn PDF document text
    • http://sshs1962.info/clients/3/33/33dcd814b32da85629335a95ab3d0158/File/89616650280.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e687558493---lixerasuzuxivufezonodiwo.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/47633693870.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b9bfe442e71---jadomawewe.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/209babe0a5445a32096c84c88ef2c991/befulakuzol.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/masibefizofaxevaki.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/28601874063.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072701c3c0d7---6197614080.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/54252947923.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/podewozanasosul.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///82645551728.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef366ef3db---moremabevonagalidotanu.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/5jlmm44n3548s6gmsv2sl9p1g3/44154204036.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/g0lggi8483al9hntehrov91hre/81915767532.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/f319e9d10728a830fa9d4dd06c594b13/gogosudugekafowujenamu.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/eed2c463a1c9c7e1d73dbe4c5e183708/sogajufutozedaxopeda.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/59869685075.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=republic+of+cyprus+governmentPDF link annotation
    • 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_off0000ebf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF2 11128 bytes
SHA-256: a45027cd8104652375a5d608729a3eeb6916ce9a37e53d123a657e2c0b1a718d
font_01_sfnt_off000105bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BF 16868 bytes
SHA-256: 8d48fed9fa5243509c73edb58e50d3f728ba3c43e9171ccb7ef5af791d4c3480
font_02_sfnt_off000131c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1