Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7a4b86797c6c82d…

MALICIOUS

PDF

85.1 KB Created: 2021-09-16 19:49:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 639884531d264b4e83be77569f1cfc01 SHA-1: 8a7f491814b25c07c85d68c3b145aeeee7e30058 SHA-256: a7a4b86797c6c82d56339286036d1227bc1b5a542b8c6e8583b38e9f09721fb2
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags this behavior. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://adikkeempat.com/contents/files/76944139982.pdf In PDF document text
    • http://bwlpsalisbury.com/uploads/files/23966029870.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/1926222843.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/vidugokorigokunusuradepa.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/sebem.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16142865ec92e5---lunew.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613731325af1d---vexusexalesesovidawuwul.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/55204570362.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0e08c426c---65369545636.pdfIn PDF document text
    • http://kezheng.net/Upload/file/rivinobuxuk.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/e286cb0db1bfbbc3c0e06adcf87e4530/76120128674.pdfIn PDF document text
    • https://brakos.it/file/peritatekikuvexefuxisogib.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/wazemidekuz.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/13464695534.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/suvamotelavusa.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/161324930a868a---36091415824.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e92fe2dc44---zasetiwafewesusunojuf.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/68540820480.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/gemolarinam.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/malivuvujosomopizijosu.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/20894700571.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/1820990103.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=windows+live+id+sign+upPDF 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_off0000e859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE859 18068 bytes
SHA-256: 60b031e2095c4829b6b00c0bc0308201a1ab5a3037ffda1d932dd99bceb501cf
font_01_sfnt_off0001172e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1172E 10452 bytes
SHA-256: bdd1ca4bd355df13b165da60e68a0b13191eab86a3c9b4437ffc0246b37ab187
font_02_sfnt_off00012ed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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