Malicious PDF — malware analysis report

Static analysis result for SHA-256 21bddf96c6acdb02…

MALICIOUS

PDF

88.9 KB Created: 2021-08-07 17:12:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b6adf2a3a3d0273a6dfccef4ca8a5ccb SHA-1: 1c50b1eb857fd4ef6932cc4011132f2919208ff5 SHA-256: 21bddf96c6acdb028def1d890948bb65c2da87d1bcbd7601609f155e9e5f38a8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious content. The 'SE_REMOTE_SUPPORT_LURE' heuristic suggests the document's purpose is to trick the user into installing or connecting with a remote support tool. The numerous embedded URLs, many pointing to compromised CMS upload storage, likely serve as a link farm to host or distribute the actual malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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://webmenuplus.com/images/file/sirenipewu.pdf In PDF document text
    • https://majubesar.info/contents//files/49246238788.pdfIn PDF document text
    • https://rumahbaruku.com/contents//files/polosatitosebepawepoxe.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d93443db8---32065548948.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/niboxofimabibidonufagati.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606da4d53b71c---bafasabarafosodogoxopa.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/7b8acad664b1328aece4a519ace8768f/22010003102.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075bd8c7f140---vafibefibarevewikumeb.pdfIn PDF document text
    • https://istanajp2.com/contents//files/26504327302.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16071841ab16d8---29797924295.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e3c0de897---53677331684.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/2724661738.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/60846015081.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/budodigufipipup.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607498b120f39---zizineviwojav.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/78333954093.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094d72286a75---24434083796.pdfIn PDF document text
    • http://simonide.org/userfiles/file/vodokufolutum.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/nigulojejigusimonuwidixog.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210721_AA83D97064F3FA1F.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/t4jbf279hd5k5v4jn0v84uvvr2/53770297371.pdfIn PDF document text
    • https://anfauglir.com/images/file/gusiziradejobofaz.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/79939123132.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/92119853494.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/mexejigefivatasopogelisa.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/2152970696.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=donut+truck+simpsons+tapped+outPDF 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_off0000f43a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43A 10820 bytes
SHA-256: 1472ebd6b197ea4ba55de599be43d585e48eb4f4925a0088aace8fda46b6061e
font_01_sfnt_off00010d2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2F 17444 bytes
SHA-256: 2bc5cd69f132b414782be3d8e2669d850595eae53593b4d9a5d87bac48f78ccf
font_02_sfnt_off00013aab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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