Malicious PDF — malware analysis report

Static analysis result for SHA-256 97ba8b344d113df6…

MALICIOUS

PDF

93.4 KB Created: 2021-09-07 12:42:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8318fa9cf2bcbebdff29297e4b25990a SHA-1: d62560474fce21580eedf37835adc532b66d6239 SHA-256: 97ba8b344d113df6fdda95751dbf6e2db4408ef52b32f209e42496f97c61546f
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites hosting further PDF files. This behavior is indicative of a link farm designed to distribute malicious content or facilitate phishing attacks. The ClamAV detection and ML classifier further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2efa3c72eb---munogeno.pdf In PDF document text
    • https://queensflower.nl/clientfiles/zabaw.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/52024815851.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/domaguvupeligativ.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/60016842336.pdfIn PDF document text
    • http://belst.by/upload/file/42548997882.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160aad1add4c92---zebiwaru.pdfPDF link annotation
    • https://grandhotelbulgaria.com/userfiles/file/vodoxutajagonuzijorix.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/xitepekowagimutariw.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/74438753742.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/buniraribugo.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/66829568072.pdfIn PDF document text
    • http://mensagemcrista.com.br/ckfinder/userfiles/files/91027554086.pdfIn PDF document text
    • http://stananddiane.com/clients/6/67/672a2699e369d648dd23e03de9deda78/File/32180342941.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160933ed6f054a---91331100514.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16116c033cf90f---24222738708.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/duap4d736ms6ejsr96ghlt1i6e/25304149407.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/a4ac5e542b9fb58cf18d9aa3292c71cb/gisalipif.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e23abd22611---80598515158.pdfIn PDF document text
    • http://strahyi.ru/images/file/58566859668.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/ad0aea545d22c938dd964cdba2ad9640/76024723745.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/53579089956.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/89049049390.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/b8750fce641a0c2e5bbdf4f1dc3d3ecc/25977277245.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/30760741723.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/49365971895.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=ludovico+einaudi+nuvole+bianche+pdfPDF 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_off0001056f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056F 10612 bytes
SHA-256: e3b1437a4df038d8a73370fea0f3080d793211fd53a092d218d3fe4652daebe9
font_01_sfnt_off00011d58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001356a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1356A 19256 bytes
SHA-256: c45407334c00c06cd966b2182b7dc3b4ef28e9cf3ae35f0a6d89246a3f5b2982