Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7f2337a6ed364f3…

MALICIOUS

PDF

84.0 KB Created: 2021-09-10 02:31:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d7f15fa57551750eebb9dc445c1e8473 SHA-1: 50c6314dbfa88d83ee909532cef3b15aeba7b5be SHA-256: f7f2337a6ed364f30de99ee83613d2e07f8ca62284fe9ef75c80f7b5ecc8c212
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://archism.ru/uplcv?utm_term=life+on+mars+tv+show+streaming PDF link annotation
    • http://ruiqingchem.com/upload/files/35982467019.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/92182243310.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/putusupisabete.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/53151428974.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7c59dc100---19476491214.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/titowidogegadumidak.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/fufireduki.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a14eda443c---19932494559.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/58946202741.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/44190981719.pdfIn PDF document text
    • http://shinhwajudan.com/userData/board/file/48133468451.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/47636eef603f37fba901f8525d2138df/zikeser.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/xafabefolirafosojo.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/53390663215.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/51503446998.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///68429082886.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/mevodekevupawik.pdfIn PDF document text
    • https://bazk.info/public_htmluploads/file/pirijeli.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/wusitajilinejutekijave.pdfIn PDF document text
    • https://adetexfoamgroup.centralcms.cloud/galeria/files/29772350773.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/161385d6cad9aa---10973611109.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/selelituzudanuzubedekefos.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/sirumepokovamuler.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/74585254727.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/75557081430.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/87929496091.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_off0000e547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE547 17060 bytes
SHA-256: 757387db24febc16161556e5dd8e37a350f53d1b6a303b49a8843c671509f54f
font_01_sfnt_off00011168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11168 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001297f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1297F 10724 bytes
SHA-256: 618d02c696322f35d8a6e20233f55b685b3e7b91652ffbe1f18eebd348993e6f

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