Malicious PDF — malware analysis report

Static analysis result for SHA-256 595c9c8d01f27599…

MALICIOUS

PDF

95.3 KB Created: 2021-06-28 15:26:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b3edae7fab33adc2ef79b9970be74b2a SHA-1: ae6fd459663fb5b35079c399439a0faa5642992c SHA-256: 595c9c8d01f27599b71d27df33e2f59df2c0e897a4c8f130a14be968048e026a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics suggest it functions as a link farm hosted on compromised WordPress sites, likely serving as a lure to download a second-stage payload. The document's content instructs the user to enable macros or editing, a common tactic to bypass security measures and facilitate the execution of malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 7

  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714f3ff36e3---92046305011.pdf
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/vsu0aevp1s2rbgu5ahqebidfs3/xomogugulilinovak.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/1khqr8ehir2m3ebccm2ot846uf/59522338802.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1fbd1cb2a---laxomibovebazozaji.pdf
    • http://wjcopy.com/upload/files/totaxagusuwanumubifu.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/bsjjlv6efv75c7qcklhrf52kef/11318077604.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073a0254a0f1---xuvelofapudilixoxufika.pdf
    • http://ctyrkolky-gamax.cz/data/dokumenty/pugukisulutoxab.pdf
    • http://cycling-software.com/files/file/pavexigeg.pdf
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/gu0nlgjs0s010ba37ccouh30k3/13599292751.pdf
    • http://rollfactorytogo.com/uploads/files/tofotanipagemujuk.pdf
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/walatixo.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/ai7m6599s971uhcfdpjgasdc49/53521135930.pdf
    • http://rulada.by/upload/editor/files/naxufagisomilatozina.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/4cb92d9e2c66cae186f70af6d03cf086/94032722254.pdf
    • http://abpaluso.com/upload/file/27747065640.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/924e244c0b1e2a1275cbce489ffe846f/relanajikefifoxawar.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d75cc317b8e---1640509933.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160731f79d3ff0---59189456031.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddacbec25c---43944588273.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16083dd030b316---mosedamogelinabakov.pdf
    • http://velocimapper.com//webfiles/file/jowumesov.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/2c8df06c783fc3c967a476bd98904983/33266503308.pdf
    • https://autoroman-service.ro/imagini_ws/nufakodupeliran.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160afaa78dfcb9---vetosekekivofuzoxarebexat.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4adbc43b5---wazuwirewoluxiwujakemi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=can+you+change+a+pdf+file+to+excel
    • 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_off00011264.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11264 16792 bytes
font_01_sfnt_off00012a76.bin
2fbb78e9bbaf74c6bbc1109956bfb8b4ed5522ffd3983331ec9d65db3775cded		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A76 17000 bytes
font_02_sfnt_off0001568e.bin
3fa7d288eadb338aab223c251e4032df74d3f051e82a46cb78d98a94bdcf23b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1568E 10976 bytes

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