Malicious PDF — malware analysis report

Static analysis result for SHA-256 542f7e6633e0a0c4…

MALICIOUS

PDF

74.1 KB Created: 2021-09-05 14:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ca55069cd0967499f7e25dda1dc9d4d0 SHA-1: 299c8de2fef96e233aa99bc9431f6d01f373180d SHA-256: 542f7e6633e0a0c40b64ccd93bdd15c08165f996b0d0512cb5c964d4aa32e78f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV also identified it as malicious, likely a phishing or trojan delivery mechanism. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to lure users to external sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://live-net.it/file/feleka.pdf In PDF document text
    • http://quadocdao.vn/uploads/files/26417823782.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/67064432833.pdfIn PDF document text
    • http://thehigh86.com/clients/13680/File/1032784988.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/26996561026.pdfIn PDF document text
    • http://hotelrealerimini.it/userfiles/files/35168671810.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/7d9f638cb1266198abb55ac3784dc7c4/banofelupepanuzuw.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16074d877e6758---lonulularizeravofebobagam.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/wigiselin.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086dfab6ca8d---28130162754.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/a48b3899ecdbb29aa43ec45669c58e8b/jatutamibirejukajix.pdfIn PDF document text
    • http://emachn.com//data/attachment/file/22087434216.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/9hma4486sgpdqejb6h656l1v73/boxor.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/fewojukok.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/skc1asn1mc2j2fg8roi0efrc3u/gujamerelipuzababoz.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/wusokevepemedadef.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/fuvufewemuwadikuje.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab032b90439---92281188984.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/rodosubonugubarukipoduxuw.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/b0p068s6es3aa5hfb0qvbjop05/rabevesubokobusebin.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/97385615561.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/21617155309.pdfIn PDF document text
    • http://cauthinh.com/luutru/files/pojuxokod.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/benalibigiluvutifibasap.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/wujujilazaduva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=transformer+relay+protection+pdfPDF 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_off0000c1e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1E2 15392 bytes
SHA-256: 876abc4181bb39cde2d5da1b3510076a4a1920e5a956655dbdc5c7193b2a46c3
font_01_sfnt_off0000e92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10143 10860 bytes
SHA-256: dfd88c16c278acf94b36e55c075743a046987e331419566dc25ff37a7ad17c41