Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5bbf06f0e617e56…

MALICIOUS

PDF

90.5 KB Created: 2021-09-22 09:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 200119020e32023d9ae006fa98e62b11 SHA-1: f8c535afca98b7c3314118327d646cfbd1ed5d2c SHA-256: c5bbf06f0e617e56097834bc35ab3fbca941c2d1453f741ff4651f4e5b799181
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a large number of external URIs, many of which point to disposable hosting and are structured as a link farm. This suggests the document is designed to redirect users to malicious content, likely a phishing page or a further malware download. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://proleague.dk/userfiles/file/tejitoxesoxivafizonanu.pdf In PDF document text
    • http://autosoftware.company/autoresponders_images/files/munirofadarijixare.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/faserewuvukaw.pdfIn PDF document text
    • http://0975811252cool.linker.tw/files/ralufi.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/mivopavibulami.pdfIn PDF document text
    • https://monyetjoget.com/contents/files/10587543036.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/51837795627.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/21748466874.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/jujesimexil.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/39607307847.pdfIn PDF document text
    • http://www.polni.si/Images/files/85480451126.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/bazopujumudowezulawuval.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/384316270.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/9289140b93c79f5924f54d2b2e6558f9/42606915031.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/97616589099.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/29519731650.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16133fe54df8a0---tixizezofiraloxukujete.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/50458848785.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/35077734574.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613886a74a7b7---gajokovarasifimusi.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/suvur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=pencil+sketch+photo+editor+free+download+for+pcPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE403 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC15 17060 bytes
SHA-256: 9185cd37b91a492f284d6af5b62124d941ba1c7ecabefd7f016fb5c3a6d723ee
font_02_sfnt_off000127e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E9 10896 bytes
SHA-256: 743199a6f8f09c2ad93c298c39d672ff9a5f8d5226a6280c0bc212298e6e2090
font_03_sfnt_off00014120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14120 17520 bytes
SHA-256: e949da6121b7235ecc7a5bbc1bc754b6171d9f4be56d7bba4b4def753c1ba8ba

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