Malicious PDF — malware analysis report

Static analysis result for SHA-256 be8036f03df17efd…

MALICIOUS

PDF

88.0 KB Created: 2021-08-01 22:42:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c2bc74d92f5f4196702f37c89097e403 SHA-1: 7968d558ad0a9f99d7ffb042fa3f12d859b6d0fd SHA-256: be8036f03df17efdd1e8e767f7db58b6e10941a3c30f9815887f23945915240f
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of a link farm suggests an attempt to manipulate search engine results or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830733b6acf---70364218615.pdf
    • http://massvt.sk/editor_uploads/system/files/zifapebiwatubodeg.pdf
    • http://anhuifan.com/upload_fck/file/2021-5-21/20210521035111417020.pdf
    • http://ahxxzx.com/userfiles/202106/file/solifomin.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/sn1uqkg0d94fcad23m6m7e8i02/26109569841.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160d19513ec644---63310089396.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/128c40d5a14ec4eecc00d5e9087daea7/xibufemepagipaxitulu.pdf
    • http://yucehukuk.com/resimler/files/76273611037.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/6c43a9ba8efe8b54447a7e06dbac4aea/geduzajosus.pdf
    • http://premium-t.info/files/files/bopolujefugutaluxiduvag.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16078b62ca03e9---bojukolewerizolobewosoli.pdf
    • http://driver-jazda.pl/upload/file/84628959980.pdf
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607588f8bc9d8---famudugizepaji.pdf
    • https://www.institutvzdelavani.cz/files/75814135070.pdf
    • https://mps-india.com/userfiles/files/95220585036.pdf
    • http://files.ibiza-ferien.de/file/94896507047.pdf
    • https://rmp-traueranzeigen.de/cms/files/xinipunozem.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094321dbc511---88387247862.pdf
    • http://homenet-spb.ru/userfiles/file/70557094583.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160798ad81fe2b---tovob.pdf
    • http://ray-king67reunion.com/clients/41562/File/77479287972.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093349a0251d---boxijeges.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/cfe8e458d2ee23aa99ae549a18ef876b/bafej.pdf
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bbffda49ada---tijurekixevirobep.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=minecraft+1.8+8+xray+mod
    • 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_off0000f2a7.bin
2befd4330843c0409fdd782f5a5456a2acb2755f5fcf8836563671bc5baeba25
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A7 10956 bytes
font_01_sfnt_off00010c2d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2D 16792 bytes
font_02_sfnt_off0001243f.bin
7426f9d1ddd84bd133086137ec6b12d4751a3a28b7475f100270218c9f003dc3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1243F 17364 bytes