Malicious PDF — malware analysis report

Static analysis result for SHA-256 03de1cfce5debbec…

MALICIOUS

PDF

81.5 KB Created: 2021-09-05 19:55:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5ef1f80a088a354c2f05cbf1e8db81d1 SHA-1: 9dba31eee84c925b4cba8d18db8acb05235ad35c SHA-256: 03de1cfce5debbec6a1a6b65fde96010ee708365e0f3112de1178dbfe2b83a55
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous external URIs and link farms hosted on potentially disposable or compromised domains, indicating an attempt to redirect users to malicious content. The presence of multiple links to PDF files on various domains suggests a strategy to distribute or host malicious content across different sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • 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.
  • 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://hk-keber.de/images/file/zizolafapakomub.pdf In PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/zupazopeputiwanalarivasor.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1608d45983f162---84762206788.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/jutosevosetori.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3632ae5555---jujanepet.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16108c90a03237---17735860763.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/xabafegexukevurisix.pdfIn PDF document text
    • https://bloc-immo.com/images/benipu.pdfIn PDF document text
    • http://kmsenior.org/file/files/dilovevijomoxevedunabiju.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/zitopugim.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/nomaduzikexideximafux.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/tibetiperonumalel.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b43f425aa1c---nefujerejeferalud.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160c52964373c3---58774394340.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//jofuvutalexes.pdfIn PDF document text
    • http://fedoro.ru/upload/file/92771379555.pdfIn PDF document text
    • http://aimic.com/userfiles/file/32398846186.pdfIn PDF document text
    • http://salonmysliwskirys.pl/userfiles/file/78815510286.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/7j10104nl18vt23945fl691kda/87846974021.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/jezupibarowesusoxapireli.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/31018165339.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/kewivawijizubeti.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16098fa9f82a57---71568711731.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/luwomupufekimoso.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/supafakasedenunasetoju.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/52a17264da2196a63a96b0924f5fd94d/zabiwavowitimujugegumi.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/105852e45eadd040d4c9abcf68719907/rodusofejewid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=reindeer+food+poem+pdfPDF 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_off0000dc65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f47c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47C 10232 bytes
SHA-256: 2486d8b70126fab012b52914124649925c37e1121ec8f78de8e331cf5cf1497b
font_02_sfnt_off00010b50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B50 17380 bytes
SHA-256: 93467c30a99e0dda835435923c8a459c4a8fbfbf3f3cb422a62e5f7e508d1459