Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bfef36a83db155c…

MALICIOUS

PDF

95.7 KB Created: 2021-09-01 00:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 55c15a2ac3a17041b95d042c2c3747de SHA-1: 1b6a88a02ab767b85fc00f89a6d136471c93ca4c SHA-256: 7bfef36a83db155cf376161da1d7ac78b6aceea0fad64a01bc276c3d5d5732b2
176 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URIs, many of which point to compromised WordPress sites or IP addresses, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://adabaskimerkezi.com/upload/file/kolojakovozobegixiniwosus.pdf In PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/1d4a5d28b2c4a43281e6c59e93040887/17372288918.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/99897450334.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/7144867250.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/jatojivazakuwubowolewum.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a315d0aa4ab---3060020190.pdfPDF link annotation
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a6353eb88c3---tepotidotos.pdfIn PDF document text
    • http://tillmanfamilyreunion.com/clients/b/b7/b7385abc5988d1ee605fea7695e3d00e/File/43111802135.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/gupatawokoxodewowufoxefi.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/90064682041.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/35480099062.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082494a0adbe---19604225950.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/69887184248.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/85392666227.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ab7b4333b99b4f6db4012662dfb0cd97/jogumujogo.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/42042172971.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/91553885885.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/161274e2e0b137---34049023702.pdfIn PDF document text
    • http://banghenails.com/upload/file/waxafewitujun.pdfIn PDF document text
    • http://farashimirooz.com/files/11562929544.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0563e7ffb---34336574821.pdfIn PDF document text
    • http://radiopoint.cz/userfiles/file/jorerajetukuzisofij.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/57650280605.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+say+sorry+quotesPDF 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_off00011137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11137 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12949 18544 bytes
SHA-256: 2cc9e1bf148d9bf16872faf16b8aee5bdb8cfc97a6413cb2512841bf8aafe1c0
font_02_sfnt_off00015941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15941 10296 bytes
SHA-256: c5d21d61ba5d4d69e4ba48eed74bc63565c91da8b0540288729dfb1c85011a35

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