Malicious PDF — malware analysis report

Static analysis result for SHA-256 f908b8d4b74a9b3d…

MALICIOUS

PDF

70.7 KB Created: 2021-09-13 19:36:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0872621db55dbb9578b04a84dab1a414 SHA-1: 97f1fe1f2d46277cb0e5b5528961007559970384 SHA-256: f908b8d4b74a9b3d6a62831046a1436811b39f32f863dffbac5dbb2ddc243bab
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The embedded URLs and the overall structure suggest an attempt to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://marbeyoyun.com/calisma2/files/uploads/zaneneleputofidix.pdf In PDF document text
    • http://shortguycentral.com/ck_uploads/files/rorafagepaxakusu.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/zokodukujikepepu.pdfIn PDF document text
    • http://salt17.com/userfiles/files/fejepinavisopo.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/31323356054.pdfIn PDF document text
    • https://actsonics.com/uploads/files/202109111435286753.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/9097300735.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/bonajumisaxatu.pdfIn PDF document text
    • http://inica.org/files/file///63684296942.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/67810258838.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137693c84308---gebodadowupub.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/54558411263.pdfIn PDF document text
    • https://banghenails.com/upload/file/5099207473.pdfIn PDF document text
    • https://maviet.vn/upload/files/supepeteginigogi.pdfIn PDF document text
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/49716595655.pdfIn PDF document text
    • http://akcihlar.cz/userfiles/file/94991407928.pdfIn PDF document text
    • https://booking-news.hkdnracing.com/webroot/editor-uploads/files/43080773947.pdfIn PDF document text
    • https://mywayrtk.com/userfiles/file/29017793701.pdfIn PDF document text
    • https://kurashi-kyoiku.com/cms/dat/upimg/file/gazomazewaxexax.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/tadapibonudejefugebal.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/8c1612cbaba120a8346901c41f72f6f0/10458825280.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210905_260803FEF033A2B7.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d75deb5fc8---navujonobovo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=android+force+kill+appPDF 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_off0000b576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB576 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD8D 10420 bytes
SHA-256: 0af339f0f1ce37e4ea32ca4bd3d3a4958fbc19fa611fe96c12db73377353ab0d
font_02_sfnt_off0000e53a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53A 15732 bytes
SHA-256: 16c62fd42bb641eb7671255668e690b5984c46d9951e5c46d0d21fddd1073caf