Malicious PDF — malware analysis report

Static analysis result for SHA-256 111e3327b3631295…

MALICIOUS

PDF

77.6 KB Created: 2021-09-01 21:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6761d4b57914471296a7277d739e855b SHA-1: f28c0e18cc71549085894334df81ec0f25ec3097 SHA-256: 111e3327b36312955633d8df58d730c443e1b05a192ca5b4bad130fe0d241a02
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous links pointing to compromised websites, suggesting it's used to redirect users to malicious content. The PDF structure and link farms are characteristic of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9549

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://haisanquangninh.org/data/dulieu/files/jolojerak.pdf In PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16097cd597ea1d---suvozudarezeralajibukubad.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/runawisevi.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/kipulam.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609d410a4220d---kidefirojefigupunuxudu.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/siturabe.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/68550052344.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1611991ce3d480---femupi.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095f07c4307a---20141892950.pdfIn PDF document text
    • http://h04ydivan.ru/userfiles/file/pureb.pdfIn PDF document text
    • http://truhlarstvi-strakonice.cz/files/file/dalabow.pdfIn PDF document text
    • http://waukeganeast1980.com/clients/877304/File/79681587982.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6922ee08d1---ranuwivuvubas.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6d43586ff---fojuxanuwudu.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad7b8da4d7---jovodubikavorojezu.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/wadapafogonetu.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1f69a364b---55144400189.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/kotor.pdfIn PDF document text
    • http://designfromall.it/userfiles/file/defetukadilafi.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/dozozozagabili.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/bawivuja.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/dufinezan.pdfIn PDF document text
    • http://fitviewer.de/files/file/84309384735.pdfIn PDF document text
    • https://akita-inu.lv/www/files/files/5512556309.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16087c84894e12---diribexagasefegeka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=the+fox+and+the+crowPDF 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_off0000d6bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED3 10416 bytes
SHA-256: e246f9f86cba921249191821fb9514cb27180180b5e3e8aea09df38012252ff4
font_02_sfnt_off00010670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10670 17484 bytes
SHA-256: 44ed5e632adbb78e9783844d9f2211e71c1cdc59de571dee9dccfc13ad7ad055

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