Malicious PDF — malware analysis report

Static analysis result for SHA-256 a09db28b8d01cab3…

MALICIOUS

PDF

83.9 KB Created: 2021-09-23 18:26:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 26e974a40586c43d721efe3489d2e7dc SHA-1: 00ed6e3e3f7603a2f5b790e313380042386056bc SHA-256: a09db28b8d01cab3b22a4e4eea7ffad10751458f7faad47a61d7451dfeee29ec
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, including a link farm on disposable hosting and a link to compromised WordPress upload storage, suggesting it's designed to redirect users to malicious sites. The PDF structure and embedded URLs point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://drafthe.ru/uplcv?utm_term=far+from+home+streaming+free PDF link annotation
    • https://fasleh.net/Files/files/fuzonejuwimi.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/29591716046.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/65933814179.pdfIn PDF document text
    • http://giteduguedesboires.fr/userfiles/file/medafe.pdfIn PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/madufedekugege.pdfIn PDF document text
    • http://apex-architect.ru/images/file/41000584161.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021091522560273499.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b59d6b1685---17646185235.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/vibiwibowosikiboli.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/nugosamu.pdfIn PDF document text
    • https://alley.52886.tw/uploads/files/lomajezumaludes.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/3ad7d013041a2970b80543d5439238ec/dezemazuluxuturufe.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/71697054770.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/tixukudekenude.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613180948c1d2---32732134317.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/rujevuwil.pdfIn PDF document text
    • http://boldogelet.hu/media/romun.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/mizumeminufimipopurokibal.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/57394111428.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/lerefotopidilogamenite.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/161428ea151c58---zimat.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/xogazuwadisi.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/14240487215.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/88998735382.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/21498879902.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_off0000e1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B1 10592 bytes
SHA-256: 6388b7d68ae0d19d939328434979ffa08f49ffd48ce6e987738af3dc31c4c100
font_01_sfnt_off0000f9ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AD 18544 bytes
SHA-256: 28133b6a5525de545a3d31fca9a8deb7141446101f5d40d0492c8532d1aee22b
font_02_sfnt_off00012a2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.