Malicious PDF — malware analysis report

Static analysis result for SHA-256 63778afc3fdde7b0…

MALICIOUS

PDF

167.7 KB Created: 2021-09-02 07:13:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 015c7baee1c95f9925a503711cdaf23e SHA-1: 21c5cb538436f96b3bc383d1f48d4c62467091cc SHA-256: 63778afc3fdde7b0f6e595737a82a916f9ef407405f08cb593a92f3ab10c1a85
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links, many hosted on compromised WordPress sites, directing users to external URLs. These links are likely intended to lead victims to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://huntic.ru/uplcv?utm_term=pancytopenia+icd+code PDF link annotation
    • http://jingkangchem.com/upload/files/vefevifogobimudewejaj.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8080709135---wopirurop.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/74026210674.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2b4b484f6---mezetugonixarexapop.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/uj46ilp5okiv0tc5ho3mfghbsf/18241299026.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/galunuredigela.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b04bd4f033---januxokatifupapiwikupen.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/ganumajanuv.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/120bc70fd0698e83a7c211c0163e350b/5552385033.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/mlmjq8h04hc5mqqttjcv9s5fat/70327862211.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/caa240b8fda68e8a308f84483e8dc27c/61315064623.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210506075859_1642664888.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/89829810019.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/48455048822.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/61445147154.pdfIn PDF document text
    • http://envigest.cz/upload/file/37345536852.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607283035b107---wobotu.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/84338032156.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/12506976987.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121a6711f5d3---70851260093.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/ab84e1e71dbdc131f109e16b13b54010/15362217009.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/megilodavapokexenonud.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab164f1333---zonona.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_off00022709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22709 10308 bytes
SHA-256: e53fdeb8f7cacc1847475c18ebc4c9a87d7bc5f1226a3ab7abf562b4d66a2fd6
font_01_sfnt_off00023e6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23E6C 22520 bytes
SHA-256: f4d291baaa13b6facfbc57c94a4c61b2791875d43de8bd228f5e4f56323b4eed
font_02_sfnt_off00027850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27850 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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