Malicious PDF — malware analysis report

Static analysis result for SHA-256 57e8011144064620…

MALICIOUS

PDF

87.8 KB Created: 2021-08-14 23:31:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9965330c65ebddd05f558236fb3565f4 SHA-1: 567c12d6458eadbf3c0b64dd29db1a41d0fd9fce SHA-256: 57e8011144064620b24f835e44bea1f2663da9d66f05b439a7da6ad1b84376ec
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to various domains, some of which are associated with compromised CMS uploads or disposable hosting. The primary purpose appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://fhs76reunion.com/clients/0/00/009202203981f132fd14d012a57c0fe5/File/rapaserotesiwevodavazon.pdf In PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/4aa5bacb9e2a691c60a244adbe347688/16125603858.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca2f0b0a32---61277621072.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/motirinuji.pdfIn PDF document text
    • http://coytex.net//ckfinder/userfiles/files/14594487829.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160f2c0477bff2---benodonuvesusifi.pdfIn PDF document text
    • https://csn-alliance.com/data/files/sijipuzuworizepimirafata.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/efc55a12fd89f21a4f8ada7c30adfca7/fotidilafipasikerewobiti.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/0hpu6cs07p9559b6ns0m1pd2fq/bofotemakodolewo.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/43903764903.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609485ba65613---sajesadap.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/julizovanusumafesurajize.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a17275bdf3f---3755918119.pdfIn PDF document text
    • https://bombapin.com/calisma2/files/uploads/78183781011.pdfIn PDF document text
    • https://air-separation-supplier.com/d/files/renorok.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/80998458456.pdfIn PDF document text
    • http://boatmonies.com/uploads/files/welamidanudowufide.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1610f5fd1c8481---18430516358.pdfIn PDF document text
    • http://short-story.ru/upload/file/93722462729.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/dalasujoriligajixoka.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d22230400c1---fopabutugajuf.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/wapevawurinox.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/natezuxoxozosevabo.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/22270757938.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=python+code+examples+for+beginners+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_off0000eea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA1 17604 bytes
SHA-256: c05f5a3259d68fea4284ba74e8cba57614afc4ced13879f52c705f21418f4b62
font_01_sfnt_off00011d0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0B 11424 bytes
SHA-256: 91cf5196ffc2e114684f214fd6bcb4b273217160e5c978d1fb52b70a04005805
font_02_sfnt_off0001376f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1376F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1