Malicious PDF — malware analysis report

Static analysis result for SHA-256 f582c3647b0b9383…

MALICIOUS

PDF

84.2 KB Created: 2021-05-25 07:08:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 006643d8ddf272d29d85dea5dd528739 SHA-1: 1bf67169084101f5e22c465f530e78831c53256a SHA-256: f582c3647b0b93831bc65ceadb9c096cc25802c9d932998f00e797039c48ded0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a URL with 'utm_term=kinemaster+mod+apk+2020+4k+60fps' suggests a lure for potentially unwanted or malicious software downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a76c7d8e2f---28438688802.pdf
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca49b46a58---vuwoto.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8810f3b88---sizasomesajunegivef.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/6cc166c48c45ac93761db3ae89f1a394/37308701833.pdf
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/ksj80uga4ih6hnt5ln236m05l7/fajatotemefod.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d48c562a6---18643796051.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16076c77bec46f---kemamefuxinubolibomuzorib.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c982b7001---93533366734.pdf
    • https://mmszke.hu/files/file/xozumutotufirasutetijiten.pdf
    • https://vannordenvastgoed.nl/userfiles/file/56201370821.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/355918549173f0563f8050c54ce1363b/40596372967.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/6fc089651e4dec841eaa88487531db69/87006463925.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/2787479ab5b2a98d8b7b491b88808a20/44496295873.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/3146fedb6880556db94212517676d093/46346529292.pdf
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/kh951lr0ucjik82pkomnoitm4j/44260434140.pdf
    • https://mfdesign.hu/files/file/28505954550.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/gg68kg0f4v2ocraou682mjnemu/nesevorasug.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=kinemaster+mod+apk+2020+4k+60fps
    • 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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d638.bin
ffeb89eaad713c9717385028f79c9757067aafb2c2382ea8cbab0e6efe35a425
pdf-font-stream PDF embedded font (sfnt) at offset 0xD638 6744 bytes
font_01_sfnt_off0000e720.bin
2a9e3286337250c88d1b510a5427f37132ca17b37850bfdb843de2770bbf6191
pdf-font-stream PDF embedded font (sfnt) at offset 0xE720 5704 bytes
font_02_sfnt_off0000fa74.bin
c6f846287785a4081d0ecf0275abc791e0d6492d049b0a4b6319da9079cbae44
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA74 2724 bytes
font_03_sfnt_off0001063b.bin
adfce20c8bdb11bb6157c318cad4ed5108d56632224d391d480a92ab302a4a18
pdf-font-stream PDF embedded font (sfnt) at offset 0x1063B 11232 bytes
font_04_sfnt_off00012cba.bin
230df8017a85ea93a5c886159708d72349b7227190d262bf2e9082262302ac19
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CBA 16384 bytes