Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5d932d6fc5a52a4…

MALICIOUS

PDF

73.4 KB Created: 2021-09-02 13:55:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0b5b0893be3ef15e2789c8724df1353d SHA-1: cf9fb307261f02a65ec208d7ee7baceb2a605407 SHA-256: e5d932d6fc5a52a4d83d52eb0f4d79c69b4d7eea81f421a6c765a9a3131eefed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external PDF files hosted on potentially compromised websites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics suggests a tactic to distribute malicious content or phish credentials through a network of deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://brothers-music.com/ckfinder/userfiles/files/99858281922.pdf In PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/901ddf72241538e5389d85b2bc92dea6/73492190055.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/cbf61608fd62c16513fb546202c4a9f4/lasisivorapavaped.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/85229879951.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160870444030ca---24059755338.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/76149505017.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610a45ee2d9c4---88422357181.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/xarikobip.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607752824f16b---59660048494.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/7f872bb10a427cc4b069e4f080fece65/76961500169.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/mefezuxor.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/duvovekiwa.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/65129863619.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/zixizipujalutiwedonigato.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609410dee8cd3---97978723106.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/b9b96c8c81faf9603e2a83a9dc82da6f/jusobetagawazotamusoneguk.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/ralapawapanalarakizitu.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b248fbbac2c---sifapekowatanubakoj.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608321cb9202b---kumiwuwewiboramefodipumif.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/5274ec9818a88e1dc2c83b53c59225e0/293714716.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5de69c275---kasav.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/90663297674d8c81ef33aaba967c58d2/kikitusufepezonofo.pdfIn PDF document text
    • https://corpus.bg/files/fck/file/75743936652.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab98e23ac62---40356600257.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/62196235353.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=greek+roman+culture+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_off0000bb3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB3F 10752 bytes
SHA-256: afaa6cab1f43f7b3cc199792200ca08ba757262048a61c9805cf7d43cb872db1
font_01_sfnt_off0000d402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD402 16972 bytes
SHA-256: e25f7e1ede6b79fbda295e4f251bb6709e59840c6534567101db6aa2855bdf8c
font_02_sfnt_off0000ffbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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