Malicious PDF — malware analysis report

Static analysis result for SHA-256 f49e0c283eeeb604…

MALICIOUS

PDF

105.5 KB Created: 2021-08-14 01:25:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 503e14f5c889c8bc0c29fd03e36551d8 SHA-1: 37ba221cfe5b33153219d6bbdada7882340bb1e0 SHA-256: f49e0c283eeeb60422ef4a13e4cd586445fac120dfbe9668214bd07572720ab0
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable domains. These links are likely intended to lead users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier clean score 0.2173

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://philabc.ru/uplcv?utm_term=best+th9+war+base+2020 PDF link annotation
    • http://aryajob.com/user_upload/file/nuwune.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/tinavenovofirumexojomolu.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769b29e00cc---31713598053.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/56bce4be2e7fd3bd0c3a73489f05354c/nuxiwagadas.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/62621458294.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/repupawojasul.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e42478f83---82876428990.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6b23e3291---81319960943.pdfIn PDF document text
    • http://hokeypokeychallenge.com/clients/7/77/77ac66e313b6cb4bf602f1678accca72/File/segorimujinaxalofig.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/10aa667d94ebd83d5b5ae3fde6918eee/34492614161.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/sufekidoduzoma.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/goletaped.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/wedezenezesinuzotenurabik.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/bonezegusatoxopiwowud.pdfIn PDF document text
    • http://asfalon.com/__files/file/74987865325.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16087d659d0475---newowisebuw.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/48205859573.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160912e5bba815---27500586542.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/647b60d455c093b976ccc8ef456224f6/fezasikokukamor.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/lhp5t0905977rftjhm6etmvdib/jemevolifosefimik.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef22a63184---bijoluseroziparabakuni.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/foxoriloxefipovixar.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/guperexosubokufaz.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/38762928790.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/516a744bd6b9f345790bcb51c2597272/perini.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/71193890732.pdfIn PDF document text
    • http://tecumseh1962.com/clients/85183/File/16863111779.pdfIn 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_off00014062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14062 19440 bytes
SHA-256: c87c0bb2609b5fa5506aa3bb04c0ad538243f8cb828574c2238f8d8ea7a0bb94
font_01_sfnt_off00017214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17214 10532 bytes
SHA-256: 662f0407144078c0255b28a0cc0cc54af39b4207905b1a4fc89467be2a851fc8
font_02_sfnt_off00018a68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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