Malicious PDF — malware analysis report

Static analysis result for SHA-256 818a4fe2b1841ecc…

MALICIOUS

PDF

76.8 KB Created: 2021-07-13 00:17:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 70136e0f6355a4a4f519af13ed156aba SHA-1: 6f670c4e4bcf24f3a55337c51e4ef0bc34205296 SHA-256: 818a4fe2b1841ecca82ddde8239ca279068f9f944a8485fb4be661ccfc9bd6c4
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised WordPress sites and potentially disposable hosting, suggesting a link farm designed to redirect users. The presence of these URLs and the nature of the heuristics indicate the PDF is likely used as a lure to direct users to malicious content, possibly for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://garglob.ru/uplcv?utm_term=unable+to+download+pdf+files PDF link annotation
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/4htpftaincvcpb54lml6jl9sd2/79930268567.pdfIn PDF document text
    • http://csc-vietnam.vn/uploads/userfiles/file/wujasixoroxixifevug.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85bb284371---giserozamuzorimajitaxaj.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/35006888587.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/89a350a8e6d9cfbbb9499025530a0512/96242984252.pdfIn PDF document text
    • https://carcable-bg.com/uploads/pictures/files/gomajatuvasizoga.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e387195bca---61861036443.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/dakazujebamojudi.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/44107700123.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/6d10a197fe67649f913f78932f412e6f/53534888239.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/0c8144996ea5eb6351c52e392c9300bf/78020456614.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16089eb292a79f---31198514610.pdfIn PDF document text
    • http://hutergroup.de/userfiles/file/zofalofimumesosuvilodowo.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/79408468205.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/dikuvufezopuwadivak.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bed37c8115b---97070770522.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/jkr89t4r7g38v67gfl31gjrghl/84114514264.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779d137510b---gafefemiwupate.pdfIn PDF document text
    • http://toonesk.com/upload/rifawazudebomeju.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/84490366417.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/54172678680.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/jukal.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082bc226cdff---59267220895.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_off0000ca9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9C 16632 bytes
SHA-256: 7cbb8166d9a389c831726d084e138035331f30db71baeb776f172fb84a4087fc
font_01_sfnt_off0000f592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF592 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010da9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA9 10624 bytes
SHA-256: 65ad547f864f0d204f29ce7f346b698ea861ea17bc3b9fe731ded079b92a9427

Open this report in the interactive analyzer, or submit your own file for analysis.