Malicious PDF — malware analysis report

Static analysis result for SHA-256 be451bbfa29ea567…

MALICIOUS

PDF

83.1 KB Created: 2021-09-05 04:47:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: aee981a2215168edd77068424f761abb SHA-1: 3da77432a97311b04597c2b26123337dfdfb3f1d SHA-256: be451bbfa29ea5672874439c2bf1caef8543abf2ae84dac1885d87b2eafcdb52
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The presence of numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggests a link farm designed to redirect users to malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely contains instructions to decrypt a password-protected archive, a common tactic to evade gateway security by hiding the payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://garglob.ru/uplcv?utm_term=cara+membuat+bookmark+dengan+nitro+pdf PDF link annotation
    • http://yousefmaktabi.com/ckfinder/userfiles/files/zikewasikabetazof.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/lenuwatowafo.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f4e1f03dd---xumaxerolefotoremejexilo.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/97491073697.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/3gn6t02u465t6m1m4s29hoc1d2/fajilamizunuzovur.pdfIn PDF document text
    • http://hnsunnyfood.com/d/files/14054815355.pdfIn PDF document text
    • http://www.neocota.com/fckimages/file/dolalikitiviwibu.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16111f14eaf941---futeneganipam.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfc08c4161---34756485628.pdfIn PDF document text
    • http://divyabodhanam.org/userfiles/file/98478684341.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021052118302170554.pdfIn PDF document text
    • http://longearedhounds.com/clients/65743/File/74420362373.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c1cc7c0a934---nuwakibekumep.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/36419613698.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/67839451693.pdfIn PDF document text
    • https://componentcnc.hu/uploads/ckfinder/userfiles/files/lebidogusa.pdfIn PDF document text
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/582035726.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/f1398k6cv8dt2iatvnqm969rlf/85581762612.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/ul6bjhelbbt9thg97jaq07pg86/kadutewatigub.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe2a3ed1cc---lowilifa.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f70ec54cf3---6968093616.pdfIn PDF document text
    • https://flyags.com/editorResources/file///pipawalutir.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2csrtod59oi6slkflemaf98ht2/jopomusebajuxoxifo.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b61952849---4462259143.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/8a9b2bab0f04fbe8111b27ca20477b1d/91977315149.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB85 19024 bytes
SHA-256: ea08a323e3dc123b8a2c89c0a64c272f0d6e82f457213cae368e454dc1da8a17
font_01_sfnt_off00010b78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B78 10992 bytes
SHA-256: c30e8f25adc6a36fd2ed63eeed4d7271b859fbb8b2580ca17efb8beedd2a4f9d
font_02_sfnt_off00012493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12493 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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