Malicious PDF — malware analysis report

Static analysis result for SHA-256 4de8ab40426adb3f…

MALICIOUS

PDF

82.8 KB Created: 2021-09-07 10:10:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 78d5a995755d580e8af0c517f6a6819b SHA-1: 530ca25d91fe7b2b6a1b0a3877aeda03e035df02 SHA-256: 4de8ab40426adb3f12b7ffa3f528790bbb2b8a906ed59bf1f1b3fe2b075adfcb
196 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to distribute malicious content. The 'Remote-support tool lure' heuristic indicates the document likely instructs the user to install or connect to a remote support tool, a common tactic for social engineering attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://oniceh.ru/uplcv?utm_term=stockholm+bus+route+map+pdf PDF link annotation
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa35966894d---66257755408.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c89892e4b29---96209263822.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf2e8a95b55---dugobemopelemunudukibovub.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/mazuparenalesutexela.pdfIn PDF document text
    • https://iword.de/userfiles/file/doxarudabunireg.pdfIn PDF document text
    • http://xn--80aadcnaeutgftohcogh8i8dsc.xn--p1ai/pict/file/10192090566.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608680788dbfa---savozitivovuw.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/186e438fabcb0ad8b39864b6b4263d6e/72908242162.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/66665680374.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/400e0b8b306f5eb1380f32aa528f8414/xatojobavewu.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce0a16f22b---dururewiselesimixiwawa.pdfIn PDF document text
    • https://atl-50.com/files/file/wuxudaniv.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161050e183371e---83748599206.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b8145280f0f---36020389655.pdfIn PDF document text
    • https://petikdaun.com/contents//files/javivebab.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/13404753746.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2e1310af8---37334536155.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/muxujonok.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b62c3f5cbe7---dagupotofavev.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/24146514095.pdfIn PDF document text
    • https://iwistw.com/upload/files/68592511198.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/udpp7i5k3d8a32d8jhos0ejupb/xalosaguvatabomem.pdfIn PDF document text
    • https://stomatoloska-ordinacija-rijeka.com/files/dosevevesetixafilipo.pdfIn PDF document text
    • 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_off0000debd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CF 17476 bytes
SHA-256: 44243e75cf391ad106387a312d4603ff450eda4377bd4b0cf43289b27d3b8627
font_02_sfnt_off000123bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123BB 11096 bytes
SHA-256: c3f1fd293d82bddaa47c00c60598ebba25018beaf7c1011b9e478e69694795b6

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