Malicious PDF — malware analysis report

Static analysis result for SHA-256 1815e09d603aac67…

MALICIOUS

PDF

83.7 KB Created: 2021-09-11 15:15:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ec7911855d7c94af621717b503d08c38 SHA-1: 3c44695c92a9e3093b547e3a6cd2d646894fa591 SHA-256: 1815e09d603aac679c614412616f2b696b2d3d6dc49ede7ebee8e045dd1adde4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://philabc.ru/uplcv?utm_term=tipperary+tree+house+yercaud PDF link annotation
    • https://careerexpo.alljobsinliberia.com/ckfinder/userfiles/files/fewonavitelomowazu.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/gexasotadeji.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/161385ebc5d4e5---88660121619.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/garowilux.pdfIn PDF document text
    • http://www.reeder.ee/files/filemanager/33690398034.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/fs1g39791qi8ll124u2tu6uqpi/fitazo.pdfIn PDF document text
    • http://kdekdyjak.cz/data/faxilosinow.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/161316c920bdf4---nikofisibavoxuredazorej.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/biluxibosuf.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/30970188547.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/toribamumek.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210906_BA4D6179AE5F24D1.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/49421621348.pdfIn PDF document text
    • https://daqing-jewelry.com/uploads/files/202109050122458397.pdfIn PDF document text
    • https://binhvi.com/upload/files/ziwitivatepi.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/magate.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/71132861437.pdfIn PDF document text
    • http://koala-al.com/d/files/26984734390.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/wotofogezulona.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/90e6ecd534fb46d492e704a211903687/50476391165.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/84981659535.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/lonifisisaba.pdfIn PDF document text
    • https://unovosti.tv/ckfinder/userfiles/files/fupejekama.pdfIn PDF document text
    • http://japanbizkorea.com/userData/ebizro_board/file/fivopozonefi.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_off0000e4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BC 16992 bytes
SHA-256: 1cbb131b442419b7ac9df2b431ad9476abf6a017315883093c7b2cab77ceeff3
font_01_sfnt_off00011071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11071 10640 bytes
SHA-256: c7a9e8acb1f7bf22cd26d1b54657407e913129fb46a2b531936444b7e3eaeab7
font_02_sfnt_off00012900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12900 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1