Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fe2b9e106bfe7da…

MALICIOUS

PDF

85.6 KB Created: 2021-06-26 01:19:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 1cd5c7d6978fef7ad07b594efb7bedf1 SHA-1: 0448bf37c2346798df6eaf6c8c2a31e8af64297d SHA-256: 4fe2b9e106bfe7da6590bb87c69369215e1f0ad3f40aa3defe5ccb8719605a08
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and potentially disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of external URIs and IP literals further supports the attack pattern of luring users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://asiabiru.com/contents//files/93991155672.pdf In PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/rodirujuwoloje.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c70d5c18e0d---wevodumiro.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/24081157098.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/c409ac904c3321e63876569a9685563a/novejubiwes.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b97fc688838---vodepezu.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a85b0ac1c57---namep.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773c2694d78---13559467636.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/kelejamepamijeruzirubaf.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0c40717ca---foxatogapusakonazigidexut.pdfIn PDF document text
    • http://saintthomasmonrovia.org/clients/a/a7/a774d5b45fc75aba9c6fcf07501e1e58/File/12861640253.pdfIn PDF document text
    • http://www.manorbymajor.com/userfiles/files/filup.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/66018748272.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-25/20210525151606994196.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/772847208.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8e63355a2---40711190997.pdfIn PDF document text
    • https://cecprint.com/images/file/zukidegugene.pdfIn PDF document text
    • http://thebrownsfamilyreunion2008.com/clients/81208/File/rafimobiwoferonujutoke.pdfIn PDF document text
    • https://rozgarnetwork.com/ckfinder/userfiles/files/pemuwuzavazijo.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160870284eeaad---tonurakewowezurokopofa.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/b4aebe8b046a76779631a29cdc8905bd/85847663043.pdfIn PDF document text
    • https://cncunse.com/d/files/lenujesegemolojabop.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609491da0723b---55204688156.pdfPDF link annotation
    • http://thedreaminitiative.org/Content/Admin/uploads/files/58800594431.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=patient+bill+of+rights+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_off0000ebd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E5 16920 bytes
SHA-256: 3d8d6b97fb91f4c4167d041e2d1ee749a34ac88931835e09dc54607925d1cdcb
font_02_sfnt_off00013047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13047 10920 bytes
SHA-256: 649dc650fbf3e2de8f11974b5391f5d2dfcfb20983548e8e494705800bebd736