Malicious PDF — malware analysis report

Static analysis result for SHA-256 bded331c79375e7d…

MALICIOUS

PDF

92.2 KB Created: 2021-09-03 13:04:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 96b7861cdec581f3ac93dbeeee5eadb0 SHA-1: f904186763f06f4a710455b323a60391e5ceab9f SHA-256: bded331c79375e7d57f80e4ccce778f4623d7bc5a5ea63f68bbc3166833e2b87
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, pointing to various domains, some of which are hosted on compromised WordPress sites or disposable hosting. The primary purpose appears to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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://smidgel.ru/uplcv?utm_term=akuntansi+keuangan+pdf+kelas+11 PDF link annotation
    • https://petek.biz/resimler/files/43147736313.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/xuvupebimotivixut.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c939c13ebc3---jamagoniwadizopomufip.pdfIn PDF document text
    • http://learningkey.org/userfiles/dexovedepe.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/fidozinij.pdfIn PDF document text
    • http://aurora-c.jp/files/files/wafozufojowize.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/vevukewovifu.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e39152a07---5143627261.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/sadazowuj.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/800ca1a46ea9e7484608452a1127499d/ruwod.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fa967b38bdf---3705345198.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/fikevum.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/gopozadojubegixis.pdfIn PDF document text
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/725bd03dc77bd16c73bd9b006db5360b/bedijekenezoloxujagabe.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608a61fe5a502---lijaviwiwewoba.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16098831e625e9---35801881496.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae93c05073---5326558193.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/5869384621.pdfIn PDF document text
    • http://glttek.com/userfiles/file/20672794280.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7c35817f6---pajiwawebaf.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf71db8b6b---ruzowosatudiwunoweziretup.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612688619d3d0---10017143851.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e61b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61B 1964 bytes
SHA-256: 535a599295b286573c61db12c4d9c0f54875ea27f4d971a5c0af2ca7a599bf85
font_01_sfnt_off0000ef2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10746 10676 bytes
SHA-256: 07889f609597a3b281f74271ad12211e599e9f5bcba1f19f88d0eb9f695bca0b
font_03_sfnt_off00011fb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB9 16220 bytes
SHA-256: 0491461efea0d38e00d742997c562b9409ed1dc9639e8611f706cfa0f0983ac9
font_04_sfnt_off0001357f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1357F 16992 bytes
SHA-256: dac4a58699094ea098e18295beaebdc54bb6baf2df45623eaf6f686d33bf46be

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