Malicious PDF — malware analysis report

Static analysis result for SHA-256 36206c4ca11e709f…

MALICIOUS

PDF

82.2 KB Created: 2021-09-07 07:12:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6b7145b3fc1fe17b814c356ee6326227 SHA-1: ed61c41fa15d8a513c926054de10a1c9723c7741 SHA-256: 36206c4ca11e709f16dd545da8e54644800646ad9eba0653047be62d3c3a735a
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised WordPress uploads and other disposable hosting sites. The primary purpose appears to be directing users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://queure.ru/uplcv?utm_term=measuring+worksheet+15+convert+the+measuring+units+as+indicated PDF link annotation
    • http://novafish.it/userfiles/files/35958228966.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c55a32170---dezepebegorisasusif.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/firujawagixes.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/161163a60a9c06---50422881285.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/nomupububoxavuzegowabita.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870cdf54ef2---wiletuzebuzebevamu.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/c3138443995cfe0ed508aa8773ddfd95/24487609871.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/devonarevidikapun.pdfIn PDF document text
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/16432046169.pdfIn PDF document text
    • http://cloverpark1959.com/clients/51168/File/3859528567.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/60a74281f027193faa191bc77fbfb313/devemoxexap.pdfIn PDF document text
    • http://fitviewer.com/files/file/zonijumufi.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607adcb80ee2b---gaxata.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69953657715.pdfIn PDF document text
    • http://airlineclassof66reunion.com/clients/c/cb/cb51827d251551eca15067b3b23580a4/File/98438580818.pdfIn PDF document text
    • http://geniuschulatutor.com/userfiles/files/30618033398.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/25317ba585ee184bf5209a1ce7c6d3b7/vetusezizexala.pdfIn PDF document text
    • https://ev-owners.jp/userfiles//files/12929392415.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/tomeboxijimo.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075cd2fcbf4d---lelukime.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/nakovakenizopezagob.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/25086598260e95c127d1b4.pdfIn PDF document text
    • http://clingac.com/d/files/kubuvisogetosapijafakipa.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/liwemazigiguvasokikeso.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed6c937835---43292594512.pdfIn PDF document text
    • 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_off0000dbb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB4 17548 bytes
SHA-256: 2d746ff9580287a86109569afdd38cc1173d402b32112544d5d8527222d4f4cd
font_01_sfnt_off00010868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10868 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001207f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1207F 11296 bytes
SHA-256: 947f311e3804b67b6a7baac008a947a7747ba614f969fe3537fb09cfb2b59daf

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