Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8c10effff9f6f07…

MALICIOUS

PDF

91.6 KB Created: 2021-06-27 08:48:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 8fccad1c691669df5af9d64cab09bd8a SHA-1: 9971fed18630d4d6c63324d819554b2f0a8f5185 SHA-256: b8c10effff9f6f07d39a2bc5318d494187611f93d6546fe04006d14dc19b42e7
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to various websites, many of which appear to be compromised WordPress installations used for hosting malicious files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for a link farm, suggesting an attempt to obscure the true malicious destination or to distribute malware through these links. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://sgcaregiver.org/contents/files/37483537696.pdf In PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/4016f0623f65ecbbefe4eff8b35fb091/wewuzewinitozobezomo.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7ba3390f70---rulekemino.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608754390aa0f---36042771273.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/f20a1594b18ac7f7d9dee35423c1d709/49807624520.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/nibedotirudavofewuba.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/e7818tios0semjljv0gj5l07r5/20238293433.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607c08ca68efd---63333598059.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/2e3uepl0a2u1tq1a7pusgoajo3/32228183919.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b0789773519---14971178781.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160afd05a8de21---86499570983.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/ahi3j1rdn0g1s1i3sp1i94lnba/45583523589.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/n718qje3ebbq87ub45dg87i2m2/41681123398.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/dblqshs9sige9gtndp5ahj3bf3/galafologijut.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c532ea774b8---ketinisaxafetesa.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/31967766043.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/6550498f5d14f8867645094d437f8214/2093368095.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/k7culq7rmctv2567in298ru8v1/tesamomegevafefed.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad4ae7a81e---58530963931.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607082ae1aec6---4017513159.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=roasting+hot+dogs+in+the+ovenPDF 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_off00010157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10157 18492 bytes
SHA-256: 780c48aa0ef8c4660b40130e6f6f4d6469039715e4be01138dec5a60849965d9
font_01_sfnt_off00013201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13201 10492 bytes
SHA-256: 709aeb3f00392bd0022075f1e618145301f77f67dc59ce2090b6641b59921ea6
font_02_sfnt_off000149a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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