Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ac4a11e7286c0a5…

MALICIOUS

PDF

81.4 KB Created: 2021-09-13 00:09:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 101b27af7dea1203d3eeaaa0fecaeedd SHA-1: 831aecd54d4a42378fa2d5821dfe819e5e319cbc SHA-256: 3ac4a11e7286c0a55f1f22faa5d9b306ecb81097a451e3b2a9fe59124e833825
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm or phishing lure. The presence of 'utm_term' in one URL further supports a redirection or tracking mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://queure.ru/uplcv?utm_term=moto+e+price+in+india+2015 PDF link annotation
    • http://huseyindurmuslar.com/images_upload/files/5186120657.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/54349384045.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/disox.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/mafimajogubixevovin.pdfIn PDF document text
    • https://ciar.vn/uploads/image/files/91723030582.pdfIn PDF document text
    • https://ahirealty.in/admin/userfiles/files/rerolebal.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/pugowidemupesiruduf.pdfIn PDF document text
    • https://smartbrand.ro/mm/file/wusuxu.pdfIn PDF document text
    • https://mobilpetrol.olajpark.hu/files/files/pasufaridigabi.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/39765072230.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/15676452927.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/88773343963.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/48207077976.pdfIn PDF document text
    • http://jump360.co/upload/files/20210908010203.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/34253183897.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/56311493120.pdfIn PDF document text
    • http://www.vako.vn/app/webroot/uploads/files/vazenofuwupuludejexuku.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/zovusirise.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/b71ada3da1603b31353c68326cb8f389/74816331474.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613505bd542b6---woruboziwosow.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/ribisinig.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/d70f4e82a99c8e9733fbf0b7d7845d55/71573674072.pdfIn PDF document text
    • https://soechi.id/userfiles/file/88366312546.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_off0000d75d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75D 10712 bytes
SHA-256: 89539541bc82c629d08cadc9b8e552c6ce365cbda6d1f390ba793c35ffaed24b
font_01_sfnt_off0000f02f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10841 18464 bytes
SHA-256: 416325f3910c4c9c73a9af4fb6c272e296a1401cde9572ab79bd9f3f3a5f6174