Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3db2257a21563a4…

MALICIOUS

PDF

93.8 KB Created: 2021-06-29 23:41:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 34f69d9c4d712574cc7dc80b514dc40d SHA-1: a4c200bb0cb260f5f94f21a55eb71e8672f63713 SHA-256: d3db2257a21563a48fcb7284a5d126b1e83d6f96bb5a0d369111ee0c7af04181
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a link farm with numerous URLs pointing to compromised WordPress sites and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it is designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://chcial.ru/uplcv?utm_term=learn+sketching+from+basics
    • http://telekommarketing.com/firme_data/files/34465034847.pdf
    • http://geopraxis.it/userfiles/files/nubuxokejategezepemiwu.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607066c3d50a2---menufisizuwozi.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/okhse917oq6i22s20p3g0kllfd/57949641525.pdf
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/cbb7baa52e37f679486d5a1bfd9c9775/vamezonafeg.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/bff452b8550ec18709efd896da60b8bf/watikunakojolagalo.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/a2860b99803370a84777dfc827f3f6e1/77692587914.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/f6519bd9d8dc47f222fac39f1677e5f6/6429344969.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfce0c47bc---jiwosezutalasipenetezifus.pdf
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/385e36jmf8qu7hq9ra3hk90iug/naxesirugolizotodexi.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/4ulk0i0idv76dtju7r944kiqr5/lotosoje.pdf
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/haauc41o27n2gmlckhbksh7l15/1385772676.pdf
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/c1dcdd8965f1a87208b367ecb803d10d/73759831882.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b843b832c6c---putigudajena.pdf
    • https://sce.tw/uploads/files/60c45879846f0.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762f632eae9---zegipotikiledef.pdf
    • http://ciccioinpentola.com/userfiles/files/68514077174.pdf
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/u7630rag1s23p6ncd0rqeni95e/2349521976.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160bda89f01a26---lupejibelokevijolerujaz.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b3a7e0918---21738358678.pdf
    • http://stalmost.pl/userfiles/file/41085129636.pdf
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609b82b4aec19---pakigotulovepale.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b12.bin
1909ed09a4aed39e40cda4d340e4405df829db53000509695af5985c5ab564d5
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B12 10928 bytes
font_01_sfnt_off00012439.bin
b1e16bd458cab0c5658c4b29bac75df038857f368acb5e50563cde383da5d9e7
pdf-font-stream PDF embedded font (sfnt) at offset 0x12439 16860 bytes
font_02_sfnt_off00015044.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15044 16792 bytes