Malicious PDF — malware analysis report

Static analysis result for SHA-256 32f65f9fa80792ea…

MALICIOUS

PDF

81.7 KB Created: 2021-09-16 15:15:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5c09800ade90414214f3730fd706e57c SHA-1: 4fc4f168f987042897cb07e0e6debb4c182fdf01 SHA-256: 32f65f9fa80792eac3b01df1f7815e176d41eaf80cf0d736b42f43f8d47d346c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents that often leverage embedded JavaScript to redirect users or initiate downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://allytemp.ru/uplcv?utm_term=vlc+music+player+for+android PDF link annotation
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/tojefaxexeximawulijefo.pdfIn PDF document text
    • https://glaskunstcentrum.nl/images/file/guwelomanomumeburo.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/d7fab0fb9d4fe0da19f55aecc28962d4/37953819447.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/de3f33faf8b2bb73ec7b829ab60b8b3d/52326971992.pdfIn PDF document text
    • https://almavilag.hu/files/files/laziwonazefedijetopexege.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/qfguin9t1k2m0g9fcunh04j682/neribasatugedogoga.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/jovavi.pdfIn PDF document text
    • https://wildnaturetravel.com/File/suzuralorupibu.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/28887659535.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161312b6b3a4bd---dogenotewon.pdfIn PDF document text
    • http://gelinyuanyi.com/upload_fck/file/2021-9-8/20210908025722891175.pdfIn PDF document text
    • http://hamayeshniroo.com/shop/file/komajomukuniwobej.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/mumafos.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/turazixof.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/kisaziseropikemin.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/tdqrdc0l3pco0431vs8m07j0u7/96928556787.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/rakagidatubotexoditodu.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/2021916_11117_814.pdfIn PDF document text
    • http://amindoost.ir/images/upload/files/kigoretokolefe.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/16455215501.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/xigakuwe.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/zefafudopukugutidinapode.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/5783901907.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_off0000d851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD851 18260 bytes
SHA-256: e80c25037c1cecf9de122a2f17ab6f7a646df1b10b0beb9f00fcbe8c14bbfa69
font_01_sfnt_off000107bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD2 10868 bytes
SHA-256: 3f8414c0393f4fbd779cad4f029dec09300c116a7b6c81667adb70d217cb7b3d

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