Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a9b05e9f365dfcc…

MALICIOUS

PDF

82.6 KB Created: 2021-10-22 17:57:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 043982496e23af5c4a6b45752aa4a48c SHA-1: 92498f2de62a1be09e429dd66ef6fed23a62abbb SHA-256: 3a9b05e9f365dfccbd7a9cafb0f58316e1f9e3bb2731700f8e224920b8abfb83
184 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, indicating a high likelihood of malicious intent. The document contains numerous external URLs, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the document is designed to redirect users to potentially harmful sites. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://wastran.ru/uplcv?utm_term=how+to+find+the+saved+wifi+password+in+android PDF link annotation
    • https://limberhurstgallery.com/imageuploads/file/ludatetuvagexuvat.pdfIn PDF document text
    • http://kotolantopeni.cz/file/22212045855.pdfIn PDF document text
    • http://smogy.ru/files/files/kapidusexatifidudap.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1616bf50d0ca14---78006039129.pdfIn PDF document text
    • http://biosite.ru/images/news/file/16731163883.pdfIn PDF document text
    • http://www.abcklima.hu/data/editorfile/522608210.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/84168354352.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/14107894048.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/85372489724.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/razonugerovibolu.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/xijilupasu.pdfIn PDF document text
    • http://nazycakes.com/userfiles/file/livafeluseveneduveluji.pdfIn PDF document text
    • http://kyokushin96.ru/admin/ckfinder/userfiles/files/18105567060.pdfIn PDF document text
    • https://angkagenap.com/contents/files/77241085029.pdfIn PDF document text
    • http://hud101.vn/webroot/img/posts/files/474943872.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16141888864f73---98677449514.pdfIn PDF document text
    • http://matrixpaint.com/ckfinder/userfiles/files/xinejosinexeditadej.pdfIn PDF document text
    • http://www.moyekolodin.com/files/66356995239.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1615afddbd362a---45325518039.pdfIn PDF document text
    • http://the100voicesofgospel.ch/fichiers/newsletter/file/31517441376.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/zakajuwopum.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///zoxosojamuwidagamolife.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_off0000dbce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCE 18932 bytes
SHA-256: 1b6853d1450de3c69dd732aa5772dca5b58348d1611a39116be5de060b62f5ea
font_01_sfnt_off00010c57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C57 10692 bytes
SHA-256: f73aa36d78ee6b63286e1c9dd846dafeba5b4d895a8b44cd601b3b4f04f8dbba
font_02_sfnt_off000124d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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