Malicious PDF — malware analysis report

Static analysis result for SHA-256 e01447b732535827…

MALICIOUS

PDF

82.4 KB Created: 2021-09-14 01:48:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a4f5f47cd2891ca116b391b90af8ee04 SHA-1: d6da033ce07556a1f4bff1101a2a3ab40118eb0a SHA-256: e01447b732535827ba88309fdaeddabb6af4e3fbb76793ae59326e2b0d236bc5
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised or disposable domains. The document body is heavily obfuscated, but the presence of external URIs and the 'link farm' heuristic strongly suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://allytemp.ru/uplcv?utm_term=how+to+transfer+videos+from+computer+to+phone PDF link annotation
    • http://abwva.com/uploads/files/76026719612.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/28532316997.pdfIn PDF document text
    • https://4of100churchstreet.com/assets/media/files/53073757730.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8bad3feb9---50044141689.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/57339513191.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/bugafu.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/64106159724.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/4833332bbb7b9c28e185eef9f8624296/dinubovoxikov.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/ketevawaz.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/37411989456.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/3839983602.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/lezax.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/24795524964.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/nebike.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/kewogujatewizeg.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/99327844711.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161342d553a081---zanatakajawevuxivuwupas.pdfIn PDF document text
    • https://journalofcritique.com/ckdosyalari/upload/files/ratiworowuxujo.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210913_46EF6AFB6EF7BE42.pdfIn PDF document text
    • https://vwb.mrv-educationservices.com/content_file/files/morivezusododejejogusego.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf3f144a84---jenexanadikezokavobu.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/lagitusisonabup.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/bogegupaxaxoleban.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b6585c2d1---dodoxezesat.pdfIn PDF document text
    • https://ww150007.linebot.net/upfile/files/20210903113737.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_off0000dc47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC47 17684 bytes
SHA-256: 6bfb95d26e2db086580b7cfcddb5b324f8a5a8a13abc1681bbc8949ef15d6714
font_01_sfnt_off000109c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DF 11084 bytes
SHA-256: 6a8b97c9e2a72313f1684817de8b9d81c505e11b25f6032bb7cfb27ba543e4c9

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