Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dbae04b50779e41…

MALICIOUS

PDF

80.2 KB Created: 2021-09-01 08:54:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 38f4788da080362af9bb6ef9365839bc SHA-1: ddbcd0f9501347fd367a078d0d2d046cab4d181d SHA-256: 1dbae04b50779e41a8c51a2ff062c3a87ee277833b3f8ea94a3081ca112174f9
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and potentially malicious URLs. The primary purpose appears to be directing users to external, untrusted resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://irlanc.ru/uplcv?utm_term=when+an+envelope+says+extra+postage+required PDF link annotation
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7ddccac90---80328811364.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/gomogelebagibepiter.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/9f68e45c8a984f1d459848c153099270/ludexukojazepazo.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b2722c9b1---69019037206.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/36736604671.pdfIn PDF document text
    • http://jcpingie.be/public/files/98248510576.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/kalavigepoluxilibatof.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/pefividowif.pdfIn PDF document text
    • http://tieclangman.com/Images_upload/files/74184492023.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f865b7243---4563889053.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/wuvutunelazofajasesom.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/rofaxofitojakojivol.pdfIn PDF document text
    • https://uniqrelation.com/userfiles/file/25281457171.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d84d981596f---wutubijovefi.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607edcb2b1296---14611404317.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/gorakotupifogodekad.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160abaa8b3b34f---7252176912.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/dae113085714afbaee7dcdb4e0e4a2c8/45639884095.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/31319991459.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844927d85de---55390834080.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/sekuvajitomize.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/sivugugezaloramiros.pdfIn PDF document text
    • 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_off0000cf81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF81 19688 bytes
SHA-256: 68f856d47ba6444e23aeecb3236c860a81f90d319f5db7673c23bab2dbb37a2c
font_01_sfnt_off00010163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10163 11192 bytes
SHA-256: 1aae6383d362e00ccffa715c32081eb83be7b1fdb125ed3c830fdfa66f23f48d
font_02_sfnt_off00011b14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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