Malicious PDF — malware analysis report

Static analysis result for SHA-256 a354dbc14782b50a…

MALICIOUS

PDF

68.4 KB Created: 2021-09-27 00:00:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b398dc123248cc50f1adb73291b9adfb SHA-1: 5e7a728962007ddad900bfc8014b22cce0ccaae2 SHA-256: a354dbc14782b50adebb4ee2313f603833c8f99ff5e375e14cd2e2d6e9478464
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to various domains, many of which are associated with compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host a large number of links, potentially to manipulate search engine results or direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://laborke.ru/uplcv?utm_term=chrome+2016+apk PDF link annotation
    • https://accidentmatters.com/ckfinder/userfiles/files/didepoluwevazefokugi.pdfIn PDF document text
    • http://huanghels.com/filespath/files/20210911061826.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/6aboadp058n0qjbn0enbs5sgv1/lemisezubomogusirogero.pdfIn PDF document text
    • https://www.terraton.com.my/ckfinder/userfiles/files/6235250644.pdfIn PDF document text
    • http://soupworld.de/upload/file/sozabijorilovewitotawapa.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/gvj6ja0je4vrq5lua254g67vj8/padidu.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/51046281062.pdfIn PDF document text
    • https://pensionradvanice.cz/res/file/zugizukifagafusuvokadal.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bcf73a9cd3---14002544322.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/49947829909.pdfIn PDF document text
    • http://magicfood-cn.com/files/20210926113723.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/vaguju.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/c3ee3da57f7faf4417cfc30d04739b3c/womowuberi.pdfIn PDF document text
    • http://pyramidplaster.com/file_media/file_image/file/19153541648.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/rakivo.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/14436057582.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/xuwixoxepuzodone.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/90224721153.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/161496663845ca---81027574535.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/minovidilavufof.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614788224a2ab---madawe.pdfIn PDF document text
    • http://sarkanyhajo.hu/files/file/merufaxizafirafo.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_off0000ad93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD93 10592 bytes
SHA-256: 5f8b0d3a4731bd9cc197f0b22944680f62fe97d2a6e47be1fb1af4bf108bb6dc
font_01_sfnt_off0000c5de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ddf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF0 15504 bytes
SHA-256: 1944ef88915d7b3c460ef8cc8fc0ed8e618e145c5f87378f6c84abfb20b727b8

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