Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ca64f3258bea32b…

MALICIOUS

PDF

70.0 KB Created: 2021-09-28 20:55:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a5a8b41e750e52536f78d1c6e255c0ae SHA-1: 5dd65394b516ffd423ad61c7d7398952007f048e SHA-256: 1ca64f3258bea32bcd28276f7e809c2b67e6979801179ee094de6fa45aaaa10b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable hosting or compromised CMS uploads, indicative of a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a common tactic of using link farms within documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://nomylo.ru/uplcv?utm_term=friends+web+series+with+english+subtitles PDF link annotation
    • http://recrute.fr/files/files/josalirozupi.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/dixatudijilulezixozu.pdfIn PDF document text
    • http://flyingkirin.com/uploadfiles/file/010858222306.pdfIn PDF document text
    • http://gr-chem.com/upload/files/37733891483.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/mipolenevov.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/futikujavekezota.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613b567f8d880---26519277645.pdfIn PDF document text
    • https://gad-elhak.com/userfiles/file/70454242166.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/91894694285.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210909205043161.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/kujajamivapewupugifutafo.pdfIn PDF document text
    • https://sikahaiphong.com/images/news/files/defidalemiv.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/famujufobim.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-9/file/poraj.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132332ea340b---33378083547.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/nodoxidugu.pdfIn PDF document text
    • https://lp-tracking.com/userfiles/file/29364981444.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/51800964129.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614014a3f1385---83797644063.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/lalupiwegomitapij.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/lifuvedusatutukapu.pdfIn PDF document text
    • http://dnt-mayak.ru/content/File/85864773119.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/gokifixusegusowux.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161442ebd9037c---63930176968.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_off0000b203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB203 15236 bytes
SHA-256: 043f5687ea1fa56edde92763a88dced9a4c5b28a24c09ad0bd7f3aeb171aa2a1
font_01_sfnt_off0000d884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD884 10548 bytes
SHA-256: d822b50a357447d0d0dd5e4f4b9c1ad1f2048452d069c04a8d95fcacd80ea1e9
font_02_sfnt_off0000f04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1