Malicious PDF — malware analysis report

Static analysis result for SHA-256 067a5f104e02d2ba…

MALICIOUS

PDF

90.5 KB Created: 2021-07-03 09:29:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 7563b19c7fd176c6bdbff0469eaf2bac SHA-1: 1ee3f1976363f7a94382c56bc85dc6683341ed76 SHA-256: 067a5f104e02d2ba8bb14b536368f65c6a9de9bf857fe01bde287dab0f4b321e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or content redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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=normal+yellow+discharge PDF link annotation
    • http://yetisirkaucuk.com/firma/files/norepinusikowogusubupolo.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/79040070744.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f7091acd7---bizekifexozamulakof.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/c851ae9747cea3398568020c82f590a9/kupalibivivinunorozupafus.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac160f4e25d---2426108308.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/vh1d2d1ijst68bod1mjh7c1ruq/7594692081.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/152e6279e7342717db86194498a50bd6/sovibijujutazizirunu.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202106290819033295.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/181541d83e131715fa824f87722abb36/94027872769.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/6ec2386e3a3be36aaa16258e489a29c6/zujoviletiwikuno.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/d93e3518ebbc90c8f370c4bdfbb31876/difelisalos.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/dhgh5o0bte1l2qtllrqs6puhs4/gekasateluwixafu.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0cdc401d29---29833091080.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/12059210769.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/potamukenibitijokopo.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/mivirami.pdfIn PDF document text
    • http://marty-triple-m.ch/inhalt/files/fevalinubixipodozawo.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/f91d5017fb518bc1a131bf4697f65ffd/kigebutuzoxal.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/vonirilopifabokudeza.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/8bhtvvlum6acp5mtm9k7l08h2p/54010804176.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/dudonubijexigafarijafe.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_off0000fc6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6D 17680 bytes
SHA-256: 806b5e9a94b2102ea2ded92215eb9fd07d9bca3a3d063a22b0402e6b9a7eb05a
font_01_sfnt_off00012a87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001429e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1429E 10792 bytes
SHA-256: 5c51c0982dd3b74c0e3caf76c4fd258d3c1d117488b597e2bf15afc519da20c0

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