Malicious PDF — malware analysis report

Static analysis result for SHA-256 67fca6f0324fa3db…

MALICIOUS

PDF

86.9 KB Created: 2021-09-13 02:32:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ad6b40317fe6aa3152a85ba6d2d99d96 SHA-1: c3bc49306083d75142d7b3f7565f275e9293a531 SHA-256: 67fca6f0324fa3db377a3865fc4e630260edef6d5ad86268fb689ca6d0f38fd2
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Several heuristics indicate the document functions as a link farm, directing users to various unknown or compromised domains, likely for phishing or malware delivery. The presence of multiple PDF link farm rules and embedded URLs supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://cheniou.handysociality.com/upload/files/lopizisedapefeziwid.pdf In PDF document text
    • http://www.zywawiara.pl/pliki/jejodin.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/18807140158.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/58147113619.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/056e301e58e04bce35c356c28236618f/mivamonomosilelufamav.pdfIn PDF document text
    • https://hinodecoder.com/userfiles/file/nerabixuwuvuvemawikolo.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/86701316831.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/fajezebakixixunagoporeg.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/13832282709.pdfIn PDF document text
    • https://kompaspt1.com/contents/files/xejuwejagowiram.pdfIn PDF document text
    • http://theloanwala.com/userfiles/file/joraluvigobizibodijepafej.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/sujuz.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/2414936862.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/11987749928.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/ridexijurowo.pdfIn PDF document text
    • https://procogs.com/FCKeditor/file/37829546345.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/45153263589.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/bapejaparulalakomitudovin.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210910110520118.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4fd86e1c2---89961320778.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/vigibebo.pdfIn PDF document text
    • https://e-room.co/userfiles/file/gobanimoviridadiju.pdfIn PDF document text
    • http://sun-dr.com/uploads/files/202109090120184942.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae61ecb5ee---93813916979.pdfIn PDF document text
    • http://hcm-invoice.vn/hinhanh_fckeditor/file/kebod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=python+new+virtual+environmentPDF 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_off0000ef5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5C 10572 bytes
SHA-256: 63cd33831ba2f5d82c4a144094854d0da920b7eb1d8d93825f123b0f0791d370
font_01_sfnt_off0001075b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6D 17796 bytes
SHA-256: ed0172421a79b49bf57f5b66025902321942ee97f7541e365d4184b5009bc279