Malicious PDF — malware analysis report

Static analysis result for SHA-256 b42972d9d636bcee…

MALICIOUS

PDF

78.1 KB Created: 2021-09-03 05:28:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 192bed7fd3f3742664b1fbd9ee70f966 SHA-1: 08ddff78244ec914eac9f4c6cec11987e88ce725 SHA-256: b42972d9d636bcee685afee28739e13b0ab2fe570c39c3174e7bb2c5e2e6120d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing lure, potentially leading to further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://hondaotohaiphong.vn/upload/files/zeziziturujoje.pdf In PDF document text
    • http://artepcb.com/upload/files/49112485300.pdfIn PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/86572731078.pdfIn PDF document text
    • http://frickcontrols.com/uploads/files/kilamugajofowuzuruv.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1e13ca37f---papavuvojokixodagepep.pdfIn PDF document text
    • http://glampingcaravan.com/userfiles/file/20210828191925.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4072bc94d---pevisupajiv.pdfIn PDF document text
    • https://www.propertyadvisersaustralia.com/wp-content/plugins/super-forms/uploads/php/files/1e661cda47573b52e2e88108ef8866c6/zigopubenuzakomu.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/15911365935.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608d69fe8ed05---34633818310.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/49705830716.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/78f14d2e5aa25ecfecaaf169deeb0fd8/78454032410.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/2687677548.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cdcffc152d1---gamowefabopetuvotadufuz.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/xawipanelara.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080f986d50eb---bovet.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7433535fb---39370939670.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/50249505485.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/52734056697.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/lunubisurowufowuxide.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/tukamidade.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=observation+data+collection+methods+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCFA 11116 bytes
SHA-256: 494f805050cf7be7f3c2b39c19e196c5d4a77ed577c45dc5e22e7292c6bd012a
font_01_sfnt_off0000e688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE688 17304 bytes
SHA-256: 16cfeb3a268eea635d0d292852782d20691bab76564f88945eeb00f7078c4caa
font_02_sfnt_off0001131e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1131E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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