Malicious PDF — malware analysis report

Static analysis result for SHA-256 d19cc0f3cf80b5d5…

MALICIOUS

PDF

89.7 KB Created: 2021-06-30 20:08:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 816e472dcbe62e2bcac4e4609356d1d4 SHA-1: 37d0179aae364d74136ba4568a05debea9d95237 SHA-256: d19cc0f3cf80b5d5a7c72b78087ab08c2dff1a02f48b9461f708082b24010e26
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to compromised WordPress upload directories, suggesting a phishing or redirection attempt. The presence of multiple unknown URLs hosted on potentially compromised sites reinforces the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4b242f5dc---88833478821.pdf In PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7143e5a2d---mowedozojadaguromi.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a965550c901---78986670097.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cd0f49dbd7d---refobitufefojunirugonemiw.pdfIn PDF document text
    • http://cunningham-reunion.com/clients/7/73/7399477c88ef979e1ad3ac38e42cffcc/File/zufiwolesu.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/e3c1b3e89ba719aa12e601eb7c89dbcf/36703579964.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/xixigisulidebevisofuwepa.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/71181018177.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/numijelimiru.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/sa8brvrvpqugmifnm2gi3hce53/jewetefamadakasenupobavut.pdfIn PDF document text
    • http://keramann.ru/uploads/files/pisekijure.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/2499323634.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/52986964093.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/4784888312.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f046c66944---mewewibevinorelinorenepe.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/31001118190.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16097aa1d5bf6f---15166925846.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/63854770550.pdfIn PDF document text
    • https://longhoang.vn/upload/files/fegul.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/72577938756.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd3b928952---14340393781.pdfIn PDF document text
    • http://learningkey.org/userfiles/2368878953.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/44131741718.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/0n6ouqun5gde96fji1pmi2nfsj/41678305152.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=maxwell+5+levels+of+leadership+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_off0000f335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF335 10776 bytes
SHA-256: ce90394f50396fd9a23244ba6a2c68c76dbfe5faf134e2b99854e18211d19480
font_01_sfnt_off00010c37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C37 22036 bytes
SHA-256: 3a44708ead77f026384c69128bcfdce5738670f973062db9e2c681009b19160e
font_02_sfnt_off00013fc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1