Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc4ec09995af9074…

MALICIOUS

PDF

91.1 KB Created: 2021-07-23 04:41:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 01424fe834d5e7ce5e94679500b2f9d3 SHA-1: 8998118bc169b5fb0472127607c3c1e03e3c4860 SHA-256: fc4ec09995af90749ad5ed1bd68b578ac77777040b6d76957ffa2c173421e011
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. Multiple heuristics identified the document as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting. These links likely serve to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a26638ebcd9---siwusixemerelizefiparo.pdf In PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/hfgic4e56u8ehm1nk3bgq1oai1/luzipogiwutuzuponop.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/44565044003.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/37664552635.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079390e9f7c8---xixuxisawukefep.pdfIn PDF document text
    • http://zuestag.ch/userfiles/files/zikoluwasoburafirorolipe.pdfIn PDF document text
    • http://stlukesmn.org/clients/17773/File/kilunarufafetusexasem.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0939186e8c---54397002978.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/gq9tf8bjjfqb925qhlf351f6qq/rigosopapulimuni.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/8dac118f52561adaaf98ce414819c976/41317343799.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebae0a1573---gomirowadarugumalo.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/59353054185.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/ltrcdhldlqqnthrepucmnhktp2/91590979027.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/60923969710.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/4d44c740579a25b68d80be804e983606/jaraxudofozofamep.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/lomejulogaborit.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/93229a2e60d973ceb3bfdf7cf998afcc/25474625518.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160bdbca78b3d5---14284244078.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/939f8d081742dc14e394a7853386ab8c/81236141864.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9042df956---piwubenagufero.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/ramuvuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=to+bring+downPDF 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_off0000e9b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B1 18504 bytes
SHA-256: 85ae98ce01e59ff3eff59bc4067703ba26b987032948cc359f53e7c6ec7501e9
font_01_sfnt_off000119a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A8 10004 bytes
SHA-256: b74cdf28f2bde1e998673fc8a0738fcdceef0d562266c7c7d69d064102e2856a
font_02_sfnt_off00012fb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000147c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147C3 5472 bytes
SHA-256: 7b36283be9ca2c3fb5a408259b8708eddd0a5e2cf04eb439c6db6f8c6df9ed2f

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