Malicious PDF — malware analysis report

Static analysis result for SHA-256 b155428eeba5147a…

MALICIOUS

PDF

96.4 KB Created: 2021-07-26 03:05:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5a968735dee91772a8abf44fada52d44 SHA-1: caa31ff6a237c5820d92d1d110150cb212228735 SHA-256: b155428eeba5147ae1c81aa5f27aa5bd061f3fdebb1689e7f387b00d4e5e6533
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains heuristics indicating it is a link farm and a lure for a password-protected archive, a common tactic to bypass gateway scanning. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the overall structure and heuristic firings point to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://driver-jazda.pl/upload/file/10449614655.pdf In PDF document text
    • http://s2ipower.com/survey/userfiles/files/luwozoxomarumorafaxuba.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/ff7495c72f2370265ae587ae325b2afc/piwarukugofuxowoxo.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/tukomozovitinivizuvo.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/2a9jfradu3704317ujdqpm4aas/40648313498.pdfIn PDF document text
    • https://rajakeempat.com/contents//files/vilinewopiwijutovaratel.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/fopatal.pdfIn PDF document text
    • https://faprosid.com/file/zirelitusagixoka.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbc25ed996---52290768941.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/848eaf4cc528f86c4477846aac14369d/vepodarobifujexa.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/q7r4cm609kbthch4ie554npioc/zimesegiwizazupusis.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/vojuja.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/f16e43b870c9d64ee866aecdd39b1b85/xopipe.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/8a5c885d4388c7ac10186031e0bd64bf/72809474804.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d65f193670265e9420b5e9c9d63c47c5/73899469274.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a262da0d9---rapisuzefujekefe.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/23373259372.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16074b0d45262d---janexakemiruf.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/vn3hf1grjjjut3s55no2rv9eg4/wijurarizapile.pdfIn PDF document text
    • https://sambelteri.com/contents//files/4419612793.pdfIn PDF document text
    • http://vietthanhstone.com/images/news/file/pugibixizeduv.pdfIn PDF document text
    • http://haileylusk.com/clients/e/e6/e6412a3df854040bfb282c4f37eddf02/File/mofomiwadawujilitubawod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=calculator+app+to+hide+photos+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF823 16988 bytes
SHA-256: 00dbda921ff6b2afd78de8252e848354e79e2b8a1d6425dc8eab54641f3adc33
font_01_sfnt_off000124b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013cc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CC1 18388 bytes
SHA-256: f5477cd0f2e2e07ec97087217d71b1ec4584693be36556d6f51edf2a9598ce23
font_03_sfnt_off00015934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15934 10740 bytes
SHA-256: 115b80a9e152d2dadd1ec59c302412e6b9fdf7d090065800b2211f4c9b0776b1

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