Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b3e8cd7dc697591…

MALICIOUS

PDF

86.0 KB Created: 2021-08-03 07:55:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9ba17d8cbe6eb839ddc064b96b76c09d SHA-1: a84d1a44e07ffad61790761dda05efaaf0dc5747 SHA-256: 2b3e8cd7dc6975910acf52ac5c3298a4107809478737ff23ee9515b6347616df
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS upload storage and disposable hosting. These links likely lead to further malicious content or phishing attempts, consistent with a downloader or redirector pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/trf9dg9ajuvmm1a3tmmb09mreq/bodalemikil.pdf In PDF document text
    • http://lhjmfamily.com/clients/5/5d/5d8645f74963a96e1aea25f3b610eff6/File/77342720334.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a33a2ceeb2f---kezuzipufobewevidap.pdfIn PDF document text
    • http://nghiencuuykhoa.com/uploads/userfiles/file/wuwugutipiponirejurumali.pdfIn PDF document text
    • http://brukbet.com/user_images/file/87764067880.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/mupugaliginos.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/mqir5c7hepf9u80hke3ldid79r/puruto.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/josuwezoreli.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/080a7cee69e19fee92783d34bd8c3b78/28978601954.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/vuxurenoxamarunub.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/togidowugududufejisopeber.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/10455396291.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/iqaijp8cglsh52rju5kktr1lr1/68257997651.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607800d80b56f---79511589882.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/31976431444.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/c9506144c1111cd4c94388d5f53da4b9/razedulagofop.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/ropubipiwunida.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/korazarogojevetepiraninen.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/petifowuki.pdfIn PDF document text
    • http://techhssilverbuffs.com/clients/61416/File/51428838875.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a191c1912bc---83404655052.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=4th+and+goal+2015+cool+mathPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD8 10732 bytes
SHA-256: 3e6543107251b437ca18014acab2be069fc39563848aac79755fd52127ddf8fc
font_01_sfnt_off0001062f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062F 16764 bytes
SHA-256: a6223caf42f086b406d323433475503a68095bbb1617484dc5865aebca613c18
font_02_sfnt_off000131f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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