Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff9fdcc2885da804…

MALICIOUS

PDF

85.6 KB Created: 2021-09-04 14:02:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f796d6f737f7e3886dd350c5d0e68726 SHA-1: 6a3f4f5ef3efcb925f7ac38dd8503e5ebf063b4e SHA-256: ff9fdcc2885da804a2aef05f7b4c054025f248b94952f57284b1bcaaea29214a
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to multiple domains, some of which are associated with compromised CMS uploads. The embedded URLs, despite some being marked benign, contribute to the overall malicious intent of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://billedbutikken.dk/articlefiles/file/jakenomatapesoxemefeje.pdf In PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/33396977795.pdfIn PDF document text
    • http://akcompany.vn/uploads/userfiles/file/42383672636.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/b646063d19d8c25c78ee2fcb0b5c52b6/duxamawimenu.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/punabijazovoraguzet.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/fivepu.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/f77aa961a0e66033745e3a421daf6a42/12728262652.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-5/file/56922214365.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2c291688a---dovuramisevimaf.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/81318727569.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/xuposibanasajipez.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/4227a496f4afd9620a7f9f1ad5204e44/2959329225.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/21944784827.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/gubozad.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e81a0b5529---15959559569.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/98367835815.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/2794045484.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607daa9de2f15---ziwuwilupezonemozag.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/mitawobibe.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/32642342925.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f56546ce40---99886709492.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/b4222917566c02e682b89b71b2efb999/noxotevolotuw.pdfIn PDF document text
    • http://come2menorca.com/images/file/86524729997.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161121028be16e---7306888818.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=automatic+car+starter+manual+transmissionPDF 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_off0000ed72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED72 16632 bytes
SHA-256: c201e8d612722eaf595507b49adcf943aa8c2f581467daad21ad6a4632142077
font_01_sfnt_off00011891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11891 10472 bytes
SHA-256: 5f516e79b2c807c076e4627679517d67f1046054496b0f0b50e86d0b37d7a018
font_02_sfnt_off00013062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13062 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1