Malicious PDF — malware analysis report

Static analysis result for SHA-256 738e2fd26876aff1…

MALICIOUS

PDF

79.8 KB Created: 2021-09-17 04:38:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 176f5c27ba836839a28069778b9c685a SHA-1: 4f4119e51d9d3edb1a002f50f5e334f6d8c2b32c SHA-256: 738e2fd26876aff1c75aee0c6f577bde629924a79ad3ecf7a142c525a540eb2b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The sample is a PDF document that employs a fake CAPTCHA lure to deceive users into clicking malicious links. Multiple heuristics indicate the presence of link farms and compromised CMS uploads, suggesting an attempt to distribute further malware or phishing content. The ML classifier strongly flags this PDF as malicious, and ClamAV also detects it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://bankubezpieczen.pl/userfiles/file/zapejasevotowag.pdf In PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402b25884e1---12345633328.pdfIn PDF document text
    • https://aukshanya.promosing.com/alpha/ckfinder/userfiles/files/zeburivo.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/59774231324.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/161419bbc0fa84---gujotajowiguloxa.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/kibix.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161390edf3fdbb---viduseb.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/ruxafevobelemilixinigu.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613172b16cc6c---datisevibupirikolev.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161421d0e1beaf---xizegexabipalaw.pdfIn PDF document text
    • http://2222.netsociality.com/upload/files/90772097190.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16143d8804c42e---22463237462.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/40311493215.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/2986058316.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/161321b3fdbee6---13760203984.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efc18bd378---86689294021.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/biwemegazedepabunavuremi.pdfIn PDF document text
    • http://advocaatindex.nl/images/uploads/vidaziberurudeviwaja.pdfIn PDF document text
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/gesekovudupidizapazalebu.pdfIn PDF document text
    • https://ctapigroup3.com/contents/files/zexevetononoxitu.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/97502721499.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16135303a466ba---zevofavorojebiferaxujab.pdfIn PDF document text
    • http://spbi.cz/res/file/78008433456.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=fake+card+generatorPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DC 16884 bytes
SHA-256: 53d703a9fd1347217e0afa8ebb64aa5d9a6ae7d9826d67cc5e70667e86030ae8
font_01_sfnt_off0001025c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A73 10308 bytes
SHA-256: 151aa84628b123f16ecd4169f1c624dbcdb2f250378531de5cb2666c1cc8f74d

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