Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c0a8c7cc033c7f0…

MALICIOUS

PDF

86.2 KB Created: 2021-08-03 16:29:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d8f2452565ce785c567d6ed332f06325 SHA-1: 2d30bbb1d2eeb85031b7ce22c08cfb700395dcc9 SHA-256: 5c0a8c7cc033c7f0a4ffc4640def77a633447b8e9dec93b509c68a665318ac17
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to external resources, some of which are hosted on compromised websites or disposable domains. The primary purpose appears to be directing users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://kiuruvedenlukio.fi/tiedostot/file/72178481938.pdf In PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/1tcn9cuvtaa7v6cfttgo1qv30g/tokabu.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/73641468899.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/88738415285.pdfIn PDF document text
    • http://granitemountainranch.net/userimages/zalabiwipowamopu.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/dirinuruvefabumedode.pdfIn PDF document text
    • http://health-bridge.in/upload/file/xidokexulemarag.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/p3tb1u70lsollauhkep8hrsoc3/88145994394.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/lazutu.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/dawebiwaditopiv.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/a07a7d556370cf604d4aeeabe1ac5ef4/bavevowuladar.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/ca157876eb82d58c0d6602eaf4628a6c/34268601726.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c9698aeeb---42582779509.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160baeb4dadbbf---sekevaxesetosenexetoxefi.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/97751667152.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/71184122960.pdfIn PDF document text
    • https://eclearusa.com/images/file/lokugalevupisazone.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608827ec022e8---pizivudexaririgasefe.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4313ab7c6---64019037891.pdfIn PDF document text
    • http://lungtransplantopen.com/clients/d/de/de7cc03d42bda6b8b84c8ac9728529bb/File/jipobumeribumamolezuxo.pdfIn PDF document text
    • https://zhansq.cn/upload/file/14057612788.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=farmville+2+apk+para+ve+anahtar+hilesi+indirPDF 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_off0000e9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B4 18624 bytes
SHA-256: 99bc5d3cb9fff53e23b7ca1ef4a244c1b06e09d04c52d49b9deb6ae0fad9e528
font_02_sfnt_off00012fbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FBC 10792 bytes
SHA-256: 9a694eaa561e6beb85d3edd75277bd4cdf448da140fb0f12e782ea8f7cfb8fce

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