Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a97757037a7ff13…

MALICIOUS

PDF

79.7 KB Created: 2021-09-09 05:06:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4250f72d4a14a12c65c8ecf17bcdee1c SHA-1: df9ea6a5dd6cbc26f1e6bd0e838f07fe85873b24 SHA-256: 5a97757037a7ff134e9ea36adfcd5f578c6d580e802636b702d3ba04af395a46
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, directing users to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The primary function appears to be redirecting users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://americasbestwingsbeltsville.com/uploads/files/juwolar.pdf In PDF document text
    • http://encino.kopanramen.com/uploads/files/lipikib.pdfIn PDF document text
    • http://suamanhinhlcd.net/userfiles/file/4758299063.pdfIn PDF document text
    • http://modern-pro.ru/files/file/91034043170.pdfIn PDF document text
    • http://merklink.nl/site/data/ws/files/molorirofufoj.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/sikulewav.pdfIn PDF document text
    • https://airxps.com/userfiles/files/19673021877.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/6888597281.pdfIn PDF document text
    • http://corising.info/sa_upload/userfiles/file/20210906042501.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/1b96no4dab3afbgsubnd5kvsa2/49412448292.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/fawatake.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/70242011303.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/97794151556.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/60063404759.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/sobuvilojuxarigove.pdfIn PDF document text
    • http://hindel-relax.ch/ckfinder/userfiles/files/72518399945.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354fecc1ab9---1036114265.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161308d9f0e312---pudufawamurimupesidoxuma.pdfIn PDF document text
    • https://nhatngudongkinh.phapluatvietnam.com/upload/ckupload/files/bipuzabulesid.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/75944783444.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/wiwinisalanera.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/18179521876.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/xinodufemotenedatanisu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=android+1+scary+teacher+3dPDF 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_off0000d125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD125 10740 bytes
SHA-256: 4c003096f42ee75118a3f43311b048203a6e840e87bd9bfbe225215998cdd0ae
font_01_sfnt_off0000e9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FE 18048 bytes
SHA-256: f0cac73667b10c237f772107502c87404f6a18d0f66272bb5f0490e97d79557b