Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e821c16c13e95b6…

MALICIOUS

PDF

89.5 KB Created: 2021-06-25 15:35:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 46e1a8c85bea01b908c4b60487e9c528 SHA-1: c0af0a746a14cdddb0503b016864cd46776e25dd SHA-256: 2e821c16c13e95b6ebf4646b719e0f3051341027f7c9ea0b3098eead659ad1a6
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. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://jpind.pl/userfiles/file/7152519434.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/89ea31268b459b5bb64cccae13d9e071/xifoze.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/t6qt4dm4gb8d7hjdl0apl0ct70/baduwemigimorupapepaduxi.pdf
    • http://liyangah.com/Upload/file/pevixumitanelivosefavuka.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/7497dbf612da26358e174b237c0e9407/lijofopobojuwozi.pdf
    • http://limoride.net/gallery/file/27598810134.pdf
    • http://amirafouad.com/uploaded_files/file/33408809535.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/0110dad1ae721920179663d65f15af1a/finakodizezadiditovuninik.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/bej5eqpmac64b6eg3cn2n9i5v0/33083405551.pdf
    • http://aite-materials.com/upfiles/file/jatojiduropizovorif.pdf
    • https://cgeminfos.ma/upload/file/83857710319.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609df93eba80c---78945971755.pdf
    • http://botosani.ro/img/uploads/file/62400540353.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16088eafa3a775---48613389854.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc46929f0f---tofopo.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074c6d3abbf0---74496420759.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/4121b0781a0fa6382270d8b5b61dc6f8/71637287282.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=half+up+half+down+pigtails+curly+hair
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/bf50a09bf2f8857112321096086e9cb1/robuget.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef42.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF42 16792 bytes
font_01_sfnt_off00010754.bin
ffe026b68b57344dd95eb54c43325d6d200a891ee4bcb808c8c041447ff919f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x10754 17528 bytes
font_02_sfnt_off00013508.bin
5b3c947262022625ef2d4cfb2d0fa10a94f23c97611fd4c7364bfcc62a76ce6a
pdf-font-stream PDF embedded font (sfnt) at offset 0x13508 1732 bytes
font_03_sfnt_off00013d3d.bin
ae1eda50a7a37c1108923f91f3af8d9f52cbe35e90ca6551167caa5cebf87a79
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D3D 11060 bytes