Malicious PDF — malware analysis report

Static analysis result for SHA-256 67cfa8eb260f429c…

MALICIOUS

PDF

80.4 KB Created: 2021-09-18 23:02:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cdb4ccbd2030b42e9cd8a734a6a23b29 SHA-1: 861e6a348f0bbe75fc542123f22e706b7552e17b SHA-256: 67cfa8eb260f429c5010b407874618c93b49e1a69728d10a3d7a9325a69f9c64
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. Numerous external URLs are embedded, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF-specific heuristics related to URI and link farms further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://ketchas.ru/uplcv?utm_term=best+iptv+august+2020 PDF link annotation
    • http://hoshitorionline.com/uploads/files/gatuduja.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/86960477660.pdfIn PDF document text
    • https://sambelteri.com/contents/files/66677634274.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/49428524081.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/mojijijebalape.pdfIn PDF document text
    • https://matraci.info/UserFiles/File/busebevuto.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/rubak.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/96752698988.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/lovam.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nemuvo.pdfIn PDF document text
    • https://magerp.org/upload/files/24120680067.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16133701d4ce21---10732563948.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/nevulagijifuna.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/04539214f977130f07ac5d80f7d25997/vajidixorapupev.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/pibavakipimisefurat.pdfIn PDF document text
    • https://derya.afmiletisimajansi.info/resimler/files/77089852793.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/pojogesex.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/97485005251.pdfIn PDF document text
    • http://noithatphathuy.com/Images_upload/files/74960454875.pdfIn PDF document text
    • https://globalcareerclub.com/FCKeditor/userfiles/file/guwimepufuzufasub.pdfIn PDF document text
    • https://ewt.cz/res/file/51128640686.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca809d88a7---judodapapeko.pdfIn PDF document text
    • http://anninh247.info/upload/files/goxuk.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_off0000d431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD431 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC48 10520 bytes
SHA-256: ffbe69f7a12d7b4a59a6d9a92b359f16a2bd0325b1c83ea956467c1671d64662
font_02_sfnt_off00010482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10482 18312 bytes
SHA-256: 11b0dfc2f6d07feee25b612a6380c894a816b8a0240b090fcd435fc7a0642c9e