Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4dfac262d709593…

MALICIOUS

PDF

86.3 KB Created: 2021-08-18 01:51:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: be5f7131ac160e3ca0f33997603486b1 SHA-1: ac8ceb924ee92e48b1c113574fbfa69d4bab228b SHA-256: f4dfac262d7095931ce51dda4110eff99bf2a1cbf0d09088ee0b84865f850ebe
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is often used to redirect users to malicious websites or exploit vulnerabilities. Several heuristics indicate the PDF is part of a link farm, with many external URIs pointing to potentially compromised WordPress sites or disposable hosting. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://accounting789.com/ThImg/file/17970647160.pdf In PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b837f567369---55345410790.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/zeduzosesekoz.pdfIn PDF document text
    • http://d4sontario.ca/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/627540511.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/92b179bf5728e53c7070a56c6a026815/14478960895.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/45137312143.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/9h90f3md8oei36fvugv6fp2g82/7240195323.pdfIn PDF document text
    • https://actorconseil.com/files/file/fipatovuzaxixulefonet.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097cc11249f8---nijutej.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/3710d9f2539f7d6c18d385cde1cb7098/bixisor.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/gaxasawububebadegubuk.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/66114540684.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/25988450074.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f13ed835ca---welekase.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160ddc34ca6650---xafew.pdfPDF link annotation
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/d8gj1uftk32o7tb5h8ptl2m8g4/42554959554.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/tosozetanuvaxugagoxa.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/81301649088.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/87666589646.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/cknf8pg94t8687tlhf7d98fem3/dekozegegaromezit.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/n1obcsvfeu66fi0g4dt2bno6e0/94463340945.pdfIn PDF document text
    • https://win-win-keiba.site/js/ckfinder/userfiles/files/93153299194.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec29cad260---gatijowisosekofujogubeb.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/tusokenufabalavekozonoxiv.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210613_9531EE61AD9FBD7C.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+eat+a+low+fat+low+cholesterol+dietPDF 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_off0000eed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E9 10548 bytes
SHA-256: affc49d0bb2d2072a943633902ae8242728a732a142e37d9604e3a649512a914
font_02_sfnt_off00011f15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F15 17028 bytes
SHA-256: ca762cf19f60f604cd6c69dee566b8079fea3f02361ffeaaf03ba9eb44b5602e

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