Malicious PDF — malware analysis report

Static analysis result for SHA-256 93b4dd19fb6d3efc…

MALICIOUS

PDF

101.5 KB Created: 2021-09-06 23:54:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 00d925a40b66b67db63f0a07da518230 SHA-1: ba6375ef99b148615efc8103e8321e8cc343f4c8 SHA-256: 93b4dd19fb6d3efc2160f098170b8d45d5dd7263818b6f4fcf37b2ca25186296
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm, with many URLs pointing to disposable hosting and compromised CMS uploads, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards an attempt to redirect users to malicious content, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://yyfxsw.com/upload/files/944027954.pdf In PDF document text
    • http://superplasticizer.cn/d/files/pukopuzelelajozok.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0538bbe3fa---43652196439.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/57bhdjn858henk3tj8gvl0kcen/tepatujisuvir.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e9029e8272c---56108816679.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/76308941059.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/dulurukabutasapozijusud.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/winukumafi.pdfIn PDF document text
    • http://meta-min.com/files/tenetirofonuzobuvo.pdfIn PDF document text
    • https://purmoradiatoriai.lt/images/files/kipagudatexuleg.pdfIn PDF document text
    • http://asja.ua/userfiles/file/sofekotum.pdfIn PDF document text
    • https://aletihad-group.com/userfiles/files/32217320173.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100356d7ab33---76892843709.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/82505882930.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/rbmm98kgpdhmo09j4jhibq5j50/vifanipuladobokame.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/totopegadugud.pdfIn PDF document text
    • http://zonweringbelgie.nl/ckfinder/userfiles/files/wodugiranuwazofojabi.pdfIn PDF document text
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/80234748260.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/file/37437215596.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/pogufeluxusujo.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210705_9424015E76286858.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/39890418727.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/xavuwetunagemixa.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8cfc450fb6---gevogekoderoledufos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=m%C3%BClk+suresi+arap%C3%A7a+metni+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001527a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1527A 28076 bytes
SHA-256: 5a207985e96cace1dda051eed617cbee86a5f889ad13c51154b8912e6ff775f1
font_00_sfnt_off0000f29a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB1 11112 bytes
SHA-256: a746406bba4f9799b79c01bc0489c03130f0cde3521fb3e81845ea6a477e1b36
font_02_sfnt_off0001244a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1244A 19012 bytes
SHA-256: b4126424dbaf64ca5a20d5d173b917c2ed6f92c1d97b6d36f00c9a2c1410ca98

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