Malicious PDF — malware analysis report

Static analysis result for SHA-256 0467c3df11119b81…

MALICIOUS

PDF

81.8 KB Created: 2021-09-16 06:31:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: caf984435a9203ff2ee5c7f88723089d SHA-1: c11a94ec574e9b700112918389f3aeb478c60c9f SHA-256: 0467c3df11119b81d28c5aa5f9289a1a5d5ce06d776e0b639ec24a7e5ff616a9
196 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised or disposable hosting, forming a link farm. The heuristic 'SE_LOLBIN_RUN_COMMAND' suggests the document may attempt to execute commands, further indicating malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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 http://erbamedica.org/userfiles/files/75208749130.pdf In PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/27831325177.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/kukevemuxa.pdfIn PDF document text
    • https://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/15787019873.pdfIn PDF document text
    • https://jurad.eu/files/file/14176038247.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/rupomipofefapiden.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/pasuvi.pdfIn PDF document text
    • http://kitpaisal.com/mypicture/file/25129543371.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/81354136367.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/9fjmag3552o0a4n4qla157buin/55717845821.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/lilonabikajabesusasenew.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/51158686994.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/xutizo.pdfIn PDF document text
    • https://aurorabersinar2.com/contents/files/lotojefopopet.pdfIn PDF document text
    • https://alpinashop.bg/files/dotade.pdfIn PDF document text
    • https://thaibamboorestaurant.ca/phpsites/bard_ford/uploads/file/74315994812.pdfIn PDF document text
    • http://qdcmd.com/data/files/20728708953.pdfIn PDF document text
    • http://noithatphathuy.com/Images_upload/files/sibojifakoto.pdfIn PDF document text
    • http://acril.ru/ufiles/files/jiwavikose.pdfIn macro / runtime command snippet
    • https://www.hkha.org/ckfinder/userfiles/files/9570016892.pdfIn macro / runtime command snippet
    • https://dolupin.com/calisma2/files/uploads/lubowonanejotewamisupa.pdfIn PDF document text
    • http://hwayoung.kr/upfile/files/39358192106.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/8b208cb5ee0d728fe7fbfe4bf8796d9d/xepidinagamitafa.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/wikizeteduvugigakiwivete.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe0ac45a91---74446216899.pdfIn PDF document text
    • http://noithatphathuy.comIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=hero+mobile+legend+bang+bangPDF 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_off0000dd82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD82 10456 bytes
SHA-256: 0498f5998dffada7faf7039e15091b384b83b873149f79e0043b51b10b57efa4
font_01_sfnt_off0000f4d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D8 17204 bytes
SHA-256: 4fd6405087192d32001f17565be7bbcb40d9583b7806f7dedc9c68972e4856f3
font_02_sfnt_off00012125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12125 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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