Malicious PDF — malware analysis report

Static analysis result for SHA-256 9909df1f99c6706b…

MALICIOUS

PDF

86.2 KB Created: 2021-08-12 23:58:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 69b3eb0580228e67d5c7af2ccd34d914 SHA-1: 40b2aa5eba578affb8d73c3a653dc3f0a48af86b SHA-256: 9909df1f99c6706b876c3ef977ebc6c10a98521e9ba99f542992fa116cf82dc6
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage, suggesting it's designed to redirect users to potentially harmful content. The presence of numerous unknown URLs further supports its role as a distribution or phishing vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8555

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 http://birons.net/wp-content/plugins/super-forms/uploads/php/files/8abfd6f96e3f5c3da8ba8185f0c13a3f/7592201715.pdf In PDF document text
    • http://analogsys.com/uploaded/file/194530175760a1dc30a13d7.pdfIn PDF document text
    • http://julianina.dk/upload/file/21137797797.pdfIn PDF document text
    • http://falerisztika.hu/tmp/12484576433.pdfIn PDF document text
    • http://skazka76.ru/pic/userfile/78255077277.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/770947f31f04ce4a70d7ad8a1d99d9f1/8674523268.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160e7f3d822d14---23774788509.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/segutapof.pdfIn PDF document text
    • http://bertolinacare.it/file/28545235181.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/608a29d765602a19a51745af3942a50f/33469969468.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/3mfnhv0ukahaqaqfhsdi3338kf/17703880655.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f06a956679---59651726929.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0f4245ea9---ribomokovonopuvajunaten.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/kunasif.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/purevanegi.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/0c6545ac6ae6b31fa607de1892ea3674/7393957892.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160763b9f1a789---kapudos.pdfIn PDF document text
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/tebojogizereminezibegu.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/217f359f94a060886af15482da7aa86d/werikijowinowijufe.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/e32c73755ae6650b60cee6a7afd22417/16514305932.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/fatepenujigudodivomez.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e63440ff3---wunevakenizojakosaxugogud.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/xupipu.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/61145219709.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/d8d8bffbdaf1846789162ab1053d6b06/fejasobebanejexuvipapenel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=dangote+sugar+annual+report+2020+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_off0000f4fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FD 10924 bytes
SHA-256: dfdd3aa7b46a5768bbf90050f25a663af931709aa4faeada347b9ce508bb5360
font_01_sfnt_off00010e49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001265b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1265B 18240 bytes
SHA-256: ba86db5d769f7c5a28fbc7a15bd89066d3ab466574f367bac42ed1f2edb86775

Open this report in the interactive analyzer, or submit your own file for analysis.