Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb9af591289aa465…

MALICIOUS

PDF

84.3 KB Created: 2021-09-03 11:27:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1959a319a6e17a5c4c2652fcccffef42 SHA-1: 9bb48d4213091c814daa616c209c36c2c7148605 SHA-256: bb9af591289aa4653879631a12940a5141ed71bcd6c3bd7477b6d920cedc941e
96 Risk Score

Malware Insights

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

The ML classifier and PDF link farm heuristics strongly indicate malicious intent. The document contains numerous links pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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://scavilecis.it/userfiles/file/35582974815.pdf
    • https://eyetracking.pl/userfiles/file/bigigu.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160faf6df4b092---51700614816.pdf
    • http://cl-pub.com/files/files/29125080794.pdf
    • http://77owship.netsociality.com/upload/files/92544235833.pdf
    • http://arlingtonhigh1960.com/clients/881088/File/24926035929.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16074500373d85---66271973835.pdf
    • https://babetravelling.com/ckfinder/userfiles2/files/34421487802.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/161256e1a53cb0---xunaxodulad.pdf
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/pawojozugirugewemow.pdf
    • http://yournamebadges.com/withyourdog/cms_uploads/file/moremewavetizi.pdf
    • http://keramann.ru/uploads/files/71895994184.pdf
    • https://raljob.com/userfiles/file/lokebonazi.pdf
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/ced747des92q9iig82ji10vem6/66689161701.pdf
    • http://traktorpulling.de/ablage/userfiles/files/21752428347.pdf
    • http://vanlysecurity.vn/vanly/album/files/28842381362.pdf
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/e952c93e7cda43e0d0bbfc07b2a7fd31/pasiz.pdf
    • http://writtenmail.com/upload_images/file/78684537032.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/322tp67nht4grgu7fprfqs1fvg/kobuwodirikebig.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160837be8b9caf---vexabe.pdf
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/63919273107.pdf
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/bb865852faba8bf263f8cba50e230772/xekigevisumag.pdf
    • http://daiichilogistics.com/uploads/news_file/buzejukadofesixogo.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160f358efd8bc6---nusasesotonapomotisu.pdf
    • https://liniagdanskzydowo.pl/files/55927707663.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=wedding+photo+shot+list+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7f8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F8 16792 bytes
font_01_sfnt_off0001000a.bin
dcbab711ebbf88045a0bb11192b95e0a5dd2794822a6606909474d847073c1eb
pdf-font-stream PDF embedded font (sfnt) at offset 0x1000A 16952 bytes
font_02_sfnt_off00012bdb.bin
8b2121c5b7265a75cddf20f8ddc96491418d1c0bc1db300d69b4cc85e90b2b60
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BDB 10508 bytes