Malicious PDF — malware analysis report

Static analysis result for SHA-256 988c6c30b158bf22…

MALICIOUS

PDF

100.8 KB Created: 2021-07-07 12:10:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 51a96c6f9f9a205ba32ecaf36b4ede94 SHA-1: 41c1b6804632cc99f4bf6cfa00f6acba9967b533 SHA-256: 988c6c30b158bf22406d80112d2a88ab617ce892776d784eaad33752161b1364
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to artificially inflate search engine rankings or redirect users through a network of disposable hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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 https://queure.ru/uplcv?utm_term=33+meaning+in+bible
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/52d43442262883c45d2be82bf1aaba19/60799615879.pdf
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/ebvrbtj2bohqb80um0bsm2efmt/wakilufafatujogixibovu.pdf
    • http://mosvag.ru/img/lib/file/zabebobepud.pdf
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe5a6d6521---2697506944.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/g17a1grgmudk1vq3qsou38s042/gijewikiwiveguko.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/02e47b6c92b5607a8f43207e5df0bba9/tivujatokomoxuxukaregubef.pdf
    • https://firmabudowlanawalczak.pl/web/uploads/files/46940782407.pdf
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/3d7cccc8799a93cc85c9c42dc0a51f52/62652640826.pdf
    • http://bona-agra.pl/Upload/file/kupozarekanupe.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fb4ff2e1fe672fbf29c1673459a0ae21/48605171076.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085f2ee9ad19---nolezesudife.pdf
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/1d5a4396659fa4bcc3d11d0da0ce6bae/31097554762.pdf
    • http://al-bandak.com/userfiles/file/feforakik.pdf
    • http://digifast.cz/userfiles/bufawifokajomanofudivatob.pdf
    • http://asea-admin.com/_userfiles/file/20210501162140.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/98ea86f9762fab4e52c80945ae42e129/62856009173.pdf
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50193556632.pdf
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/fec7fac536858be1910f8b42f9d54b7d/vozonidupi.pdf
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/qbebhkm32u1tl2p8l0hl97ob7c/vifakutamaledixilu.pdf
    • http://mahkotacare.com/tmr/userfiles/files/womirelaxamemud.pdf
    • http://banghetretunhien.com/media/ftp/file/xorapev.pdf
    • https://cowichanseniors.ca/userfiles/file/97417981602.pdf
    • https://hiroyoung.com/data/files/ranenonagagatakadoza.pdf
    • http://crocepadrekolbe.it/userfiles/files/jetolevoji.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_off00012c8c.bin
d2e458f3b4b5435ed17486360498a45d477b30e5fbb6db34cf8ab9b30b883157
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C8C 16556 bytes
font_01_sfnt_off000157a0.bin
6ee64b1833c14ded07e0ba2c76fac5e432aba02883a9c7ab79878cd68f1095d9
pdf-font-stream PDF embedded font (sfnt) at offset 0x157A0 10180 bytes
font_02_sfnt_off00016e4b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16E4B 16792 bytes