Malicious PDF — malware analysis report

Static analysis result for SHA-256 2571e31546f69fb7…

MALICIOUS

PDF

73.4 KB Created: 2021-09-28 11:08:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 937ffdce424e8e93c66f0a6f9b9d4671 SHA-1: 015f0eee104afc1ac44c75c539748235f526f1ac SHA-256: 2571e31546f69fb737de9700bee29337023dbda44a3d96ad0fc9d96df45039e2
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 disposable domains, indicating a link farm designed to manipulate search engine results or lure users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7261

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
  • 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://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/bupikanebavepur.pdf In PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/8668451259.pdfIn PDF document text
    • https://lalicorne-hotel.com/userfiles/file/gunefen.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/36899494633.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e9f952d3d3---62861282552.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/gepabuborifabuxanak.pdfIn PDF document text
    • http://expresskaliski.info/file/zebako.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/11918843863.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307d4296fde---jonabizajib.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7791624867.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/zonexoxet.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161488b367eeb8---belorujapasi.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/mumipubabenogobixini.pdfIn PDF document text
    • https://kingbakerypans.com/userfiles/file/12336416898.pdfIn PDF document text
    • http://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/64832682719.pdfIn PDF document text
    • http://sung1.com/upload/files/77043140275.pdfIn PDF document text
    • http://divorcefinance.nl/uploads/file/lumajegotafevatubirixe.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/degifiniwoboz.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/variduloxe.pdfIn PDF document text
    • https://maviet.vn/upload/files/54013147665.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/23076152943.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/64937514038.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/gojejaxaragib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=emulador+de+ps2+para+android+requisitosPDF 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_off0000c02d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC02D 19620 bytes
SHA-256: e385e68636107658fcabadadaaf61972c0b7deb4f654c46ff951c9092fe18cad
font_01_sfnt_off0000f30e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B25 10904 bytes
SHA-256: 63fb1671ddc9b1ed6f004dfebf1e5b9dc83184ff037f93f77a5ab10fa6f44ab6