Malicious PDF — malware analysis report

Static analysis result for SHA-256 18fd53510ee43ecf…

MALICIOUS

PDF

69.7 KB Created: 2021-09-06 07:29:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e721c878ac9ee250b3bb947ed2faf6f8 SHA-1: 109c3b0771d2abdf5cf56898a2ad8883bcf0a909 SHA-256: 18fd53510ee43ecf5bab65a83f897978b55322c1a999a9fbf103698d55a440dd
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to a variety of websites, many of which appear to be compromised or disposable hosting. The heuristic firings indicate a link farm strategy, with multiple URLs leading to PDF files hosted on compromised CMS uploads or disposable domains. This suggests the document's primary purpose is to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://coretry.ru/uplcv?utm_term=pondovac+4+manual PDF link annotation
    • http://aivieksteslaivas.lv/userfiles/file/silefawamujiferub.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/tk9e52t597gv23lbhe24od79b4/kaxifatigu.pdfIn PDF document text
    • http://hornets88.com/clients/56662/File/37067378211.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c85792652e---68311483775.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/detifizepugokuxu.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/69855695400.pdfIn PDF document text
    • https://diamond-marketing.cz/soubory/zisopalujirepexog.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/japuzemotigisijok.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/juzutosobunilija.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/77ecaded8c548b5e0af93ad0c3ebab47/jozafufolem.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/35439777985.pdfIn PDF document text
    • https://upchealth.net/wp-content/plugins/super-forms/uploads/php/files/5da10f95ec11a23876e4e33d82fa66f0/livegan.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/pevuwigekiromupojubel.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/nopigenewafuloru.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/0de3423954c1686dee4dcec63a2f818c/33314271492.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/82016541153.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/donalupifazefewodebidow.pdfIn PDF document text
    • https://mylin.in/ckeditor/ckfinder/userfiles/files/kodutatinolutovaloda.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a914c10f1---gojerikerabigabuw.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/deluvafoz.pdfIn PDF document text
    • https://mimpiindah168.com/contents/files/14440298263.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/8688479310.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/retapizijolovu.pdfIn PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/pibebimolinifaduvuxuf.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/gelirenebubesivipemu.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_off0000b65f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB65F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE76 10184 bytes
SHA-256: 97df1302a7139d03ef3954a8ba34186e96e5a97d125b8b694f2f6839b12b5b4c
font_02_sfnt_off0000e54b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54B 14656 bytes
SHA-256: 4aa55bcd7fdfda5b51a6be1ac06b81fe6437f59c87bc7ef842851248ab9e6b74

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