Malicious PDF — malware analysis report

Static analysis result for SHA-256 c24fa286afb25e38…

MALICIOUS

PDF

80.4 KB Created: 2021-08-28 22:14:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 77153fddb1a10886ccf06ffd49970a0d SHA-1: e76dd7f03d0069371c51b6d12e2a3d0cabccf21d SHA-256: c24fa286afb25e382dd4aa23aa4e1e0ba4dc70b90c6391038858f6d5f5c0680c
172 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of urgency and download button lures further supports a phishing or social engineering attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 http://hncastlecable.com/d/files/tasefasimisivapedixuzi.pdf In PDF document text
    • http://shinex-auto.com/userfiles/file/jakosolij.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/f2e9fc826c513ff38f61b4ea4cb2bce3/75797371741.pdfIn PDF document text
    • http://vanphongphamhienluong.com/upload/files/geninaroguwuliwizivi.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a28491c7ed8---14889453421.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc2a61386d---sijijoradomipimas.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c981b274e1---67465276084.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4277a0c9ef---58137968522.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/luvegaziwisiturebesagebe.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/gumamej.pdfIn PDF document text
    • http://skyline64reunion.com/clients/e/ec/ec378541aa9b73e2b99de5ca5545ec21/File/zigemoxilusevigifo.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/mesanosavoxatefuz.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/p7a1m44vtoaqediaemvfkratl6/vifedulapawukekoj.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608634a1a2749---zumugulajazixarigon.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/43379508940.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d36bb0ca13---36049310521.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/3meimnksdmb6h8utgvn6ii98c4/58592406718.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/xugivoledoguxulono.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/42949983163.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/dacb7118c1e6b3021909b58adfdb1f90/36414905672.pdfIn PDF document text
    • http://gfb.it/upload/fck/file/466349437.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/gro0empnmdrfm4dbv1sbdck3lc/54674800617.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/nixusatogakigarofalodari.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/52e626a85c5ca0e7654cb01984e07f52/rizokagumatibupazopope.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1609deb2b35624---29121156276.pdfIn PDF document text
    • http://chinocorporatechallenge.com/clients/6216/File/11820473003.pdfIn PDF document text
    • http://kleiberit.ru/files/file/29001394304.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=ebook+tagalog+stories+free+downloadPDF 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_off0000d001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD001 19488 bytes
SHA-256: 0c92c5b868d27bb80b8277636c5b9ea6eee7be6195eb0131663a42c62a56809d
font_01_sfnt_off000102b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B5 10832 bytes
SHA-256: f993feaf3854ac435107ef98e9007c4c2837b4a48504030d3ac65398722796e2
font_02_sfnt_off00011bb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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