Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ecc8a51ab56904c…

MALICIOUS

PDF

85.0 KB Created: 2021-09-18 19:28:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0bb36f971909d4a66fbc62a5505d4976 SHA-1: 4e4b7d248617d253c87ad41e61bf88ce1dba4593 SHA-256: 8ecc8a51ab56904cf238e3036eed73d460cb7c985282466f62d1a03c67f51ebd
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://pistant.ru/uplcv?utm_term=mx+player+pro+apk+android PDF link annotation
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/05a12a3a01929ab6056b81e0ff015bfa/kowowizotiwalefogudadovek.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/78568222763.pdfIn PDF document text
    • http://dailygiasi.com/uploads/userfiles/file/54665402986.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/rufijizeseji.pdfIn PDF document text
    • http://fibertechnique.com/tmp/file/40484429087.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/46035912165.pdfIn PDF document text
    • http://ubest.ru/images/file/sesubunubuz.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/7294249341.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/6279882600.pdfIn PDF document text
    • http://riph.pl/userfiles/file/36326293789.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/65815828418.pdfIn PDF document text
    • https://ostrichtours.com/ckfinder/userfiles/files/7787853795.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/34004157947.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9a9d536fd---lijarenoda.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/sososazogebubanokulun.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/76912637890.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/679674954.pdfIn PDF document text
    • http://marchmontnews.com/imgs/file/67057489532.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/18960cd8ef550fc3634ed5454520a29c/72162137393.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/13822806277.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/41799396997.pdfIn PDF document text
    • http://gerocuki.hu/user/file/37893174899.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/3152072388.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_off0000e5ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE04 10420 bytes
SHA-256: 6594f942a535deca74640c47fe52af9dff1aba89ff0944dc397202baa735c526
font_02_sfnt_off000115b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B4 18856 bytes
SHA-256: 27adc2abc5093601748fd46a5048d1b79fdba6d6e70bbf47af62a39b4572775b

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