Malicious PDF — malware analysis report

Static analysis result for SHA-256 0530a98bad273860…

MALICIOUS

PDF

105.4 KB Created: 2021-08-12 22:29:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c00074b996c344a0c14087e6b69ee951 SHA-1: c81098c60acddf1c15444064464cb590d303fe62 SHA-256: 0530a98bad273860b84ac896075cca11d37df7e84d68020844f75c2c8313a87b
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, many of which appear to be compromised CMS uploads. This suggests the document is intended to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8420

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://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/34q3pcp2o3m9rp7t58bque3sp2/dedukoxerolavolelawejar.pdf In PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160871235265c1---gupewibedawimewigim.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/5aeddcdfc3e938efea314b4fce92a7be/73860313830.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/29475463346.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9709457a3---65302246231.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/bugix.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/pn8ifce95j4thp23aajse1utj7/fepobagaludar.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8cf667919---kijunenaju.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2d608bac4---mezogimekaw.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/kurero.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/zedikokikigew.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/xipitog.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/nepatazikozadawanejororen.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/mduv6e2fsn6birr4v02ebg7lts/bigijobaxodove.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/66781875969.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/76670123637.pdfIn PDF document text
    • http://canvangdientu.com/images/file/2672361051.pdfIn PDF document text
    • http://zekidilektekstil.com/images_upload/files/desasebesojojefoxoz.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/51636859209.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/vosojilubipuwiwelowa.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a3fdce6a4cf---55198701091.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e562a7cba75---bogefonivobotoga.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/vomr3tpp41e1tms13tqgr2pnc0/linapof.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b66e0351ff5---gusoxubunosewagekuna.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/75106149939.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+play+the+tin+whistle+for+beginners+pdfPDF 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_off00013d79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D79 19008 bytes
SHA-256: e49590f085e394a8c42e851790ef70ddffbdd1dab578baf90c1ffd352f3f833e
font_01_sfnt_off00016f14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001872b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1872B 11108 bytes
SHA-256: 4369fc2c93be99efe807a66c589c3f1c78e38cf5ecbdd4574794ab0b294612a7

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