Malicious PDF — malware analysis report

Static analysis result for SHA-256 a725661d4b8bdaef…

MALICIOUS

PDF

77.6 KB Created: 2021-09-02 05:00:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 88ab4c712632a737922b9b3efcf4d53d SHA-1: d59db531ded8eadb9865f3968ed7e8f69892e10d SHA-256: a725661d4b8bdaef71e3d45d8f043d7116fa6346d690e08ef69a9a87083118ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the nature of the embedded URLs and the detection as a trojan implies potential for further malicious activity, such as downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://huntic.ru/uplcv?utm_term=a+drop+in+the+bucket+idiom PDF link annotation
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/3ba3d711de2279c3f57f02eff6c2bb01/62857969913.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/6019526208.pdfIn PDF document text
    • https://123natura.com/stockages/files/piburufotog.pdfIn PDF document text
    • http://yilip.net/userData/board/file/11551228242.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/zawowo.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/revozomofutezarofemujoliz.pdfIn PDF document text
    • http://fedime.org/imagenes/39422732057.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-1/20210501131728119897.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/63c9c6974e263dedbf1ea9468fa84bb2/misupaxokewawasojudug.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/momemirovuzevudam.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acddefe445a---40964693749.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c4812a3d3---jasizazerurapuzebopiz.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/nhidtd2fckq84hnqrmda7cn5e1/56679405871.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/dinenobikas.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/liresivu.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/dovufunuguxivakudug.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/0874d8ea6fce6937844025da7807f8e9/paxatofofiwajetemexaz.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/a039a90adbffb644d1244361efee0f6e/21374855296.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/20d34c00d9229acc1b471ed3604786fa/38115644785.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/tevokuvex.pdfIn PDF document text
    • http://shield-in.com/userfiles/files/7470893009.pdfIn PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/nofununopiwilulorijuvejo.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/parirupotedagedorupu.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/35572208147.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f45e61dbd6---refavowizaxakatepogufat.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/tfout6lcb6fobhkedobju63se3/25856406077.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_off0000ce2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE2A 10716 bytes
SHA-256: aeb2b53981d721217cd73fb62df95ee09a05e965fad81a116afcc771a986f0d9
font_01_sfnt_off0000e64e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE60 16044 bytes
SHA-256: f2bd8fea021a2e777808f81535519cb620536f4eb859ae714382a5f2903c89d7

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