Malicious PDF — malware analysis report

Static analysis result for SHA-256 393d08b8f3220a0b…

MALICIOUS

PDF

76.6 KB Created: 2021-09-18 21:30:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dbb5b9047e220de1ac4abe1e8a42f7c8 SHA-1: d127ff574c059f3b6be136e836bb7d578073b896 SHA-256: 393d08b8f3220a0bc4802e907535d457bd61640dbbd3ef1eed21aa07e8e76203
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://farmandari-sarvestan.ir/images/news/files/68593451518.pdf In PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/roroxezebisaw.pdfIn PDF document text
    • http://demo-enriquemora.shopcloud.es/ckfinder/userfiles/files/puvawuzi.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/desaruxegi.pdfIn PDF document text
    • https://aildf.in/userfiles/file/mukupiduv.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/25261859399.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/85350680255.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/malexa.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16144978fc659c---92791919850.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zexededinewavudenimora.pdfIn PDF document text
    • http://hrudolf.com/userfiles/68803866307.pdfIn PDF document text
    • http://wine-paraphernalia.com/files/winep/_repo/file/44059450288.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/72549003853.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/damitopawok.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/xofeta.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/613426450ec8c.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136398153bc9---73669170886.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021091813122890859.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/76196877356.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/jazegezutokegewodonobad.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/ae43c710cd82423aab726380478e5000/34026475502.pdfIn PDF document text
    • https://endeligmandag.no/e-brev/data/div/ziserox.pdfIn PDF document text
    • http://thicongdiennuocmiennam.com/uploads/files/57283989336.pdfIn PDF document text
    • http://liyangah.com/Upload/file/5952484178.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/molala.pdfIn PDF document text
    • http://mindennapi.hu/upload/file/59300875827.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+block+a+number+and+texts+on+androidPDF 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_off0000c38a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC38A 18132 bytes
SHA-256: 89fb7674440c1e7f8d14d80c549f7d72c8b97e2b26f103d3d9892ccdd290dd1f
font_01_sfnt_off0000f21c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21C 11044 bytes
SHA-256: 6ad4f4ac5d201a8928b5d9fa8827d7a11da7758dd5e3804fea8fac91bd4c42be
font_02_sfnt_off00010bd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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