Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbbb1f4ac438a0d8…

MALICIOUS

PDF

80.5 KB Created: 2021-09-02 04:13:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 26f281d7a4633a3546214ed1158c4aec SHA-1: 2e5d528bc1e800e8493f11044baf75f43fd51402 SHA-256: bbbb1f4ac438a0d86ae460d907186094a378206d3e702cd69d3d3943910bef13
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing or trojan distribution attempt. It contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites hosting PDF files. The primary purpose seems to be redirecting users through a chain of links, likely to a phishing page or to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://coonvalleycc.com/userfiles/file/48919759000.pdf In PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160c6616382784---4587210548.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a05ee884370---tipomininanuxonevi.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/36509080047.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/841d3b7679fb156cc6640a39eb69fb43/vofuredufoweb.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/e28a2a921b996bc6389a382b2766f041/20702482984.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/gajuwojipefutap.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/f128a015701a77920c492b28e6763549/zemofevusow.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202107310850437679.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/a11ai54g23guqjc3u8c9mrgfr6/tawilul.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/lagumosaxiladazafizazado.pdfIn PDF document text
    • http://congseng.com/uploadfile/files/54529552333.pdfIn PDF document text
    • http://midel.me/userfiles/file/26883187651.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926fac11652---xiwibi.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/731434b3f5ca37337b4d5947a44bbd74/jokinonelilakuvemativ.pdfIn PDF document text
    • http://hochrainer-elsner.at/upload/files/gewuvelozuze.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16077c16f580ab---fosoxijimosap.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/98551079343.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/tetixupupumegibod.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf45fd8fba5---61353984174.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/a6a95857a0db161bf9550a4d2188a87d/36429517941.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/zekinigujovotadif.pdfIn PDF document text
    • http://peoplefoster.com/pliki/widiwixotenusuzade.pdfIn PDF document text
    • http://sonkertrail.org/clients/9/92/9260a3c387aed4615f72c72c3a1da295/File/51319050434.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=where+can+i+stream+rambo+first+bloodPDF 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_off0000d35b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6D 17644 bytes
SHA-256: 9cdc9f98884ef9f2354223b7849774eef3fbd85938172dbde9ec823e22118731
font_02_sfnt_off00011949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11949 10876 bytes
SHA-256: 936dfd3f598ba5cc56aaa163371bda20a80b96bfb718bd6c4c442e0e3c916186

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