Malicious PDF — malware analysis report

Static analysis result for SHA-256 f950d6646c80bbb7…

MALICIOUS

PDF

74.9 KB Created: 2021-09-05 09:05:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4eb5569d201ed39d069a07dd80ffd5a7 SHA-1: d9ae5c30fb40f286050576616aba0ca92602f7a6 SHA-256: f950d6646c80bbb7d59fea5188b48268673209f50d8afc5a7001d0fbe479edbd
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS upload storage or disposable hosting, suggesting an attempt to obscure the final destination. The primary goal appears to be directing users to potentially malicious content through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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 http://taniaandjohn.com/clients/874109/File/zikamakewiva.pdf In PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/e19b70e7a2c88f698a8993ad0f1363b4/53120415311.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832b2b0c3a6---zepifu.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/86765163888.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/91344981085.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/wejenuvikunopepejix.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/807d3f0d82e0e2d6ed08ee0d1a71c83b/japaku.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/47601708137.pdfIn PDF document text
    • https://energooptima.hu/upload/File/bufazuwatazob.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adf03710bb3---vububusagosotilud.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607c638f3298d---79116757514.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ba92673674e2a650673940638c36ca95/xanomotazomeg.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/jodilonejimelivotirir.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/tuwudusabunu.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160dd95363a2e1---10223967787.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/40527070758.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab12050984---rixopanuduluvepedoluji.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074bcc91ddb8---xagojakazuzutaze.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/woloxoriwufidewawuzafemi.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/03e42045ece0cd0853894c80da1a29e9/37457212560.pdfIn PDF document text
    • http://jx4d.com/userfiles/file/98955765496.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/bc1lu3s890r3tlqsrd00h222f1/69724393916.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/94161774307.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=change+management+maturity+model+pdfPDF 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_off0000c570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC570 11020 bytes
SHA-256: b9eaf4e22eabf83f47a351fd9a6748c5db2f635adbcbfa08f4e2f118049e1883
font_01_sfnt_off0000dea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA8 15416 bytes
SHA-256: da5b348e2e38e4e3b20173ad5a99418d7e238856f77b15ba8d5977b09055b814
font_02_sfnt_off00010583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10583 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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