Malicious PDF — malware analysis report

Static analysis result for SHA-256 967bd3cfbc0e9c81…

MALICIOUS

PDF

85.7 KB Created: 2021-06-26 01:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 41ba287c04fbff1ba95e9076d302f758 SHA-1: a0785cd1dbf8a8153a91215f23485a434d213493 SHA-256: 967bd3cfbc0e9c816421365134ef6be3c6ef689c8bcdb85d0aba69f30e0c7a7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on potentially compromised websites, suggesting it's used to redirect users to malicious content. The presence of external URIs and a link farm structure points towards a phishing or malware distribution scheme.

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://wastran.ru/uplcv?utm_term=convert+pdf+to+word+software+freeware PDF link annotation
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/37198e46b8d11c123d4612881bc42cdd/55254101833.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16086cfefc7c4d---lekap.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088a7f6e8a2a---pofivibajeko.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be784273a54---fisufikusarotinofiloru.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/f6c91debaa66bcab6dc4524a6d896cdc/xasugetifedinaz.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/49757596002.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/74528832726.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076cf314c32a---tujesukomexutanagoko.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/0b51203dbdbdb64c8be1fa81edd28d4b/lizuxobune.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/96e85b3a3e2027339f33cd691fe9bb2f/xomuwowa.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/47694c937e6c7cf33ee1f5788b21efe6/dugowasemajukadot.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202106180100291242.pdfIn PDF document text
    • http://webinside.pl/userfiles/file/24969269825.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/2dadf862cc3200b78471cef6f0099dd4/30767937061.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d64e66aba9a---65594198621.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/iii4qehpehi1bh31hfb1vnu1n4/lidusagozamukafi.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/papifelukinufiku.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/40646207105.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/lipadegesezubutebamo.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/bef3396bace3b42e050f644a4ab2b3f0/kabulesofopafifim.pdfIn PDF document text
    • https://chptravel.ir/data/file/wuwusoxibikaveduxuwi.pdfIn PDF document text
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788bbfca060---tefotuwefukun.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095a150f0628---lubozogupoxanixanami.pdfIn PDF document text
    • http://exlluprimebrochure.com/ckupload/files/bitamawoli.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_off0000ebc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC1 17116 bytes
SHA-256: bb2278dd919c44f05a0a7f81a4c2c23f7dccc9869aca8786169055311239e856
font_01_sfnt_off000118c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130DC 10536 bytes
SHA-256: e192ff2139f0fc70970bdba616c74eb3348434f3d33f49c55f7d7c8c590a5cbd

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