Malicious PDF — malware analysis report

Static analysis result for SHA-256 45d4161fa7baf042…

MALICIOUS

PDF

132.2 KB Created: 2021-09-02 14:18:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 11e5be9e15e4c8cd33046689a2895056 SHA-1: f721184f1897de883f0063311cf95f379a1a529c SHA-256: 45d4161fa7baf04271ed6d51440e780c72fddb66ff758475d9c4d048c387a934
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary function appears to be redirecting users to potentially harmful content through a network of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://dothi.info/images/files/tivejoxek.pdf In PDF document text
    • https://aplusadvance.com/naver_editor/data/file/gefabeterexewifapijub.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609741cf286b2---30701106187.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/dc896a37ef7527621015586c7b99cf84/40188440827.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/buvumepuziveguroluxulof.pdfIn PDF document text
    • http://imoroz.by/upload/file/vopegewovurutasuvu.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0506413a74---sigonadipebidivumu.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a863d2f3260---xesekel.pdfIn PDF document text
    • http://ombs.ru/uploads/files/duwibijeluxubokoga.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210802095222.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c4179e7b3---55954927207.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/686968308.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/65f305db80230eaf08a1f747ec7abad1/17596617140.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/71309905094.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/kugerapelekezufikoguf.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/13625981186.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/fevujomulujifizeb.pdfIn PDF document text
    • http://fbhsclassof70.com/clients/f/f6/f6e65d48c6cf753e26882f86001d336b/File/momikokoni.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/18018398918.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/67959400005.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/7cd82eb4417907c90c073d207106b9a3/83901905205.pdfIn PDF document text
    • https://rajatotogroup4.com/contents//files/34516390209.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=que+es+la+filosofia+social+pdfPDF 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_off00019dfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19DFB 10472 bytes
SHA-256: 416615893a0d7820239a36fc41ec55b2c24e67a9989c920dde5adfe8f98c0148
font_01_sfnt_off0001b5f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B5F3 20980 bytes
SHA-256: bbc986c3a0812318e3996bf590346cb85fa27a6206859e1ad527948e4cf21f65
font_02_sfnt_off0001eb1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EB1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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