Malicious PDF — malware analysis report

Static analysis result for SHA-256 248fec1fb75df38a…

MALICIOUS

PDF

91.6 KB Created: 2021-09-05 09:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a7f74e8a76f770fcd0f02881acab9b7e SHA-1: 5879de4b00bd5fe6aa5289aa5f4d36e2fabe80c2 SHA-256: 248fec1fb75df38a53a3ed602fb3e51adb68a231f59a06ae54bbedb61a5c952c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF acts as a lure, likely for phishing or to download further malware, aligning with the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://irlanc.ru/uplcv?utm_term=anti+tuberculosis+drugs+dosage+pdf PDF link annotation
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a525958a65b---dixuduwominude.pdfIn PDF document text
    • http://seteo-dechets.com/images/file/30475072938.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160776dbe1b433---zusenobuwubumag.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/lanaxeguz.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/51909069098.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/notosonowagebu.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/losotagidoga.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609eff9dd0172---23815390053.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/546cf56f012f4ae417aac5dec04d91ab/60755134985.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/sexeburomopagujixozo.pdfIn PDF document text
    • http://petrduchek.com/files/21866465205.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/1ptbfh2qod76u7n9vfo0d22uq0/83631315589.pdfIn PDF document text
    • https://mashtalkandil.com/userfiles/file/46658263310.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/97503894769.pdfIn PDF document text
    • http://canadanur.com/resimler/files/digokofolirozekige.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b74d7001c59---68422114974.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/17438480387.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/1801663636.pdfIn PDF document text
    • http://jpcadonate.com/clients/4/48/4863a0bac697dd4b44f4a1b1fb44835f/File/berawopofoxetakigufabiwe.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16128075c3b295---sosikejelasulodeduxovi.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/65731542494.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/2b919c4be07cd48ed1553803cfba1120/46978636001.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160751cf57a9ec---loxemufi.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001005f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005F 11016 bytes
SHA-256: ca1f1c63b68610ccc89f38920950c57a8dd68e2c72427982f6b4caa900012c0e
font_01_sfnt_off000119bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131CD 17860 bytes
SHA-256: f4c36e16c334961627662fcdc83eb3ceb99126bf2e474d927fcd38111b86d172

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