Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8aac34b17fcd9aa…

MALICIOUS

PDF

73.6 KB Created: 2021-09-02 06:10:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 613521e9e647b36bd52c2df7fa533cf5 SHA-1: 4e7960db90208a5d6340dd4ca0150039952cd116 SHA-256: a8aac34b17fcd9aa00e59ce427bd7b74ae911c8ef26198d9d1179c0319affd7f
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm pointing to compromised CMS uploads and disposable hosting. The embedded URLs, many of which are unknown or lead to potentially compromised sites, suggest an intent to redirect users to malicious content. No scripts were extracted, but the structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/842a6e687ba28f9e8fc90fee614bb34d/13796879826.pdf In PDF document text
    • http://gzwep.com/img/file/202181134550.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/pedupajorowiwu.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/3dda185cf370092060ec33281d843361/28248076183.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608dbfd4ce178---83647406183.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/56858407446.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/57646330876.pdfIn PDF document text
    • http://www.superior-inkjet.com/login/ckfinder/userfiles/files/tazifanabuvazigikuleru.pdfIn PDF document text
    • http://hotstamping.pl/files/file/rusenif.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160f716b2ec99c---zexekozejixuzatu.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32264666785.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddae9ef054d---jigoxowakijonogap.pdfIn PDF document text
    • http://d4sontario.ca/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/wikakatezoxoj.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/31033015022.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160b4fb5935109---pogow.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/oaaqehuc935tvftce1hebhto91/31516150270.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757f30e7394---bikedi.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210706_00BB31128E6B6210.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/10112599353.pdfIn PDF document text
    • http://burrburroughsfamily.com/clients/55468/File/jebasiriwubexixabufo.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1608feff3a4c78---33697138014.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/85601918850.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848e6662a77---24915535816.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/punakonukanaluto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=r+color+cheat+sheetPDF 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_off0000bef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEF2 10176 bytes
SHA-256: bfcc668c9e3c957a39530d794d2bf019f9047ab0fb283ad87701e908300a27be
font_01_sfnt_off0000d5f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE03 16236 bytes
SHA-256: 3a17423fe98a19a1fb866013815b970fba4d8faf039b54d957bb8a8005a67366

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