Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5acb4f99834b231…

MALICIOUS

PDF

82.6 KB Created: 2021-09-16 03:06:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d49379fca52bde94ba0e9e7660bf7b35 SHA-1: b9e7249d72b11047d1a6f2b87f5f681e6b5ca48e SHA-256: d5acb4f99834b2318167ea3d046aa62771657c31a404c864a22bc0360452b108
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities to download and execute malicious content. The presence of multiple external URIs, including links to compromised WordPress sites and disposable hosting, further indicates a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=my+angel+apk PDF link annotation
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16134d2d110aec---kuzotumepi.pdfIn PDF document text
    • http://cdio.vn/uploads/userfiles/file/juwatojowevemewufenuti.pdfIn PDF document text
    • https://chineseclothingonline.com/File/60187684143.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/74622422053.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/zategitetoluk.pdfIn PDF document text
    • https://ls-machinery.com/uploadpic/files/202109020756293410.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/12490550244.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/xoguvi.pdfIn PDF document text
    • http://yesfabric.com/images/upload/File/volalafawapifowo.pdfIn PDF document text
    • http://lycee-elm.com/userfiles/file/zudogujazarixi.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16138fc845fc26---97616110568.pdfIn PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/luxaniwetivixotubu.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/xaretixop.pdfIn PDF document text
    • https://gkatsov.com/userfiles/file/befajobav.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/80459712506.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/1230007060.pdfIn PDF document text
    • https://network-italia.it/file/70365578211.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/bigopetibanupadilidebop.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/62353123433.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/90398598970.pdfIn PDF document text
    • https://alternativi.brtim.com/uploads/wysiwyg/files/fazapet.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133492351abf---tisijulolasudodazomuwago.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b6478df4e---99487953245.pdfIn PDF document text
    • http://lngpetro.com/userfiles/file/44282306664.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_off0000e0bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BC 17980 bytes
SHA-256: e15953ed2145e2970c3efc15e7d7cf7de9a6c959f0e8296f16027249723f4e79
font_01_sfnt_off00010eee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEE 10048 bytes
SHA-256: 0e8f80c4b558a53c205c073a1292da4dce63e86d5e841256043a23ec7229da65
font_02_sfnt_off0001255d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1255D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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