Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5d5aca618ac3280…

MALICIOUS

PDF

78.0 KB Created: 2021-09-09 16:33:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5afec66413fa8c0ee906395d8d2814f0 SHA-1: 36e725944665f029ed1e72c24c76c7438ea3be7c SHA-256: c5d5aca618ac328026e596ecccf816dc3b20458f5a4628076dbf0d006034ed81
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting it's designed to redirect users to malicious sites. The presence of embedded URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://laborke.ru/uplcv?utm_term=watch+nba+live+stream+free+online PDF link annotation
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef4e44a570---belepavikopifiwul.pdfIn PDF document text
    • https://ww150003.linebot.net/upfile/files/20210908110011.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/jawalaminojenijam.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/modejagebabefunow.pdfIn PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/vodibatenogavax.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/begijenikovazoref.pdfIn PDF document text
    • http://szjg.hu/images/file/zimanagezilugugesazamiran.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/96245414478.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/gm4oitc1c7b21ts34c6akl2qi2/vobositipev.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc0b33a2b7---33219769399.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307bca4c8c7---35248847558.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/zolopokafarufakerifa.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/kakodupemubaruzona.pdfIn PDF document text
    • http://abworder.com/uploads/files/xukotokurasojujoraxerud.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/vujisexikodukovapige.pdfIn PDF document text
    • http://photopuzzle.net/userData/board/file/putolowexigov.pdfIn PDF document text
    • https://mcsfood.com/images/file/68225717271.pdfIn PDF document text
    • http://objets.immoweiss.lu/userfiles/files/rugafawagebojixax.pdfIn PDF document text
    • https://sowlindia.com/userfiles/file/nonuganususovad.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/91061057973.pdfIn PDF document text
    • http://stroi-sistema.ru/img/vopixaburuluzewazoxukov.pdfIn PDF document text
    • http://firstcuwire.com/file_media/file_image/file/bududarepax.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/kepilorobaxopisisasiviw.pdfIn PDF document text
    • http://aqcorth.specialty-match.com/upload/files/xujapufezezubilipovirun.pdfIn PDF document text
    • http://asv-solnice.cz/_files/file/vujeridewoxelam.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_off0000cbec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBEC 17520 bytes
SHA-256: f9b91faac19cc3abb0a17f5add70459fdabaa9059509b4d12ee1de6093e8d99c
font_01_sfnt_off0000f9c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C3 10800 bytes
SHA-256: 69c664e79dd37059ae04468fdca2984717087ade934e0263a20e9d1b4f92f683
font_02_sfnt_off00011288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11288 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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