Malicious PDF — malware analysis report

Static analysis result for SHA-256 34e81949ab4516ec…

MALICIOUS

PDF

81.7 KB Created: 2021-09-15 15:56:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b988880b9c1097e934769ce857140171 SHA-1: 6fa37fd40eaf989e3f144802eeac09ddef2c1ab6 SHA-256: 34e81949ab4516ec28ffea97f1d468969657b1aebbe9c588663f9e679190a192
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple heuristics indicating malicious intent, including ML classification, security bypass instructions, and a lure for password-protected archives. The embedded URLs point to potentially compromised hosting and redirectors, suggesting a download or phishing attempt. ClamAV also detected this file as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • 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 https://irlanc.ru/uplcv?utm_term=windows+7+professional+32+bit+loader
    • https://yptea.com/data/fckeditor/files/5584891559.pdf
    • https://gruntbudowa.pl/files/file/zukuki.pdf
    • https://www.mnogotrop.com/ckfinder/userfiles/files/57272569948.pdf
    • https://nikolsbeauty.com/webroot/f/uploads/file/19029920389.pdf
    • https://rpdev.org/ckfinder/userfiles/files/sawililofegonakuzotifinox.pdf
    • https://drivetripper.com/userfiles2020/files/51737311753.pdf
    • http://ekorepetycje.eu/Upload/file/kawuzobewew.pdf
    • http://ccsilver.kr/files/fckeditor/file/922631694613034511cebc.pdf
    • https://facades-et-traditions.com/actualites/file/kufewajuvaniji.pdf
    • http://highlevel.pl/userfiles/file/notobaruviwovojimozaki.pdf
    • https://fa-vietnam.com/webroot/img/files/60904106849.pdf
    • http://pcccmiennam.com/media/ftp/file/fulilagawedowoloxusoku.pdf
    • http://eko-inwest.eu/upload/file/39587168129.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/mljmme9qu2rbctqb930acord54/79586316065.pdf
    • http://gwtcs.org/Content/uploads/files/lagotuko.pdf
    • https://rmp-traueranzeigen.de/cms/files/gibugususutitomizemol.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d24999f237---69798990739.pdf
    • http://nawoo.net/userData/board/file/61762895233.pdf
    • http://congtrinhnhaviet.vn/upload/files/taruketazerugerab.pdf
    • https://vettercycles.ch/userfiles/files/goxovebagoduwixatogek.pdf
    • http://thermogroup.ru/uploads/files/govotilebugilozalonepigef.pdf
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161403205430d7---35361430332.pdf
    • http://castel.lu/userfiles/files/77082494607.pdf
    • https://www.opsclown.it/ckfinder/userfiles/files/rubimuxeduzumize.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6ee.bin
00b8c6395e137bbba8605e3b09a18453590f38fc35755cb2b2f49bacf4c495d9
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EE 18508 bytes
font_01_sfnt_off0001070a.bin
8c164118ecb427c4b86543ff8bce6128d0d373c1a3a05c41bfaf335e2e503eca
pdf-font-stream PDF embedded font (sfnt) at offset 0x1070A 11052 bytes
font_02_sfnt_off000120d0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x120D0 16792 bytes