Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5f0c23b59faa709…

MALICIOUS

PDF

100.6 KB Created: 2021-07-18 11:17:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 500b1910c934092d94ad94ba74fa8d8e SHA-1: 9955faab134776e8d87a7aa089bf0309847fdaee SHA-256: a5f0c23b59faa709f0c5edbce69dc03fa4b275e946e9522a5d52b564c2843109
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The presence of external URIs and link farm indicators suggests an attempt to lead users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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://dgn89reunion.com/clients/862287/File/gesuwupewe.pdf In PDF document text
    • https://dusunceokulu.net/resimler/files/44644795098.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e0ce1d6cb---55520372422.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b894c2351c---lejifaruburapubusajo.pdfIn PDF document text
    • http://balone.net/_upload/file///ralire.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/78055830129.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcf2a4ec31---pinukojur.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/ropesaze.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/tovuvok.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a13f083715a---rikirinomojevanajes.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/88729101003.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/userfiles/files/52036741885.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a92696b499---3886452206.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/46420994500.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/dc4837a24a67ea90bc3fc34483653a5c/zolegelorelebominipijalu.pdfIn PDF document text
    • http://pmmagic.vn/userfiles/file/wilib.pdfIn PDF document text
    • https://tungqibiotech.com/upfiles/editor/files/nujikuzewawuzubixuwanu.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/8ae8b300ebf4ebb1c94c9f2be3b753b9/meragitovogi.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/20a4rhk5ie1uh0kt6l0vdlr4si/dotesa.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/47179150507.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/kaxom.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c7e529753---mixoravaru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=volume+of+a+circle+with+diameterPDF 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
font_00_sfnt_off0001040c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1D 16388 bytes
SHA-256: da9090c08b5bf4cd87dd4de6b29824159e9c0e6cc981658b4c6290204189eca6
font_02_sfnt_off000132a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A8 10624 bytes
SHA-256: 49378287bedf9445aaec3a281d6b1352528aa6f71c99cea785002cbca90e4ca6
font_03_sfnt_off00014afa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AFA 22016 bytes
SHA-256: 5cf82089d992b4a9774cf211b173c951f381052d755aa3eaea942b051297d13d

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