Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7c0b30c33dc0cd2…

MALICIOUS

PDF

69.7 KB Created: 2021-10-04 10:28:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d0f42f9e303106c236b2a60714e4f94e SHA-1: 9936b39fbae149bc2225fbc74672e0f1d68dccde SHA-256: a7c0b30c33dc0cd2d35b317e59e9ad6b5d0e69f47ea5e1d19bf82f3bca8d43cb
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ClamAV and an ML classifier, and heuristics indicate it's an image-only lure. It contains numerous external links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the overall structure strongly suggest the document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://nomylo.ru/uplcv?utm_term=root+eating+worms PDF link annotation
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/nodanugodarikivo.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/52867427768.pdfIn PDF document text
    • http://spbi.cz/res/file/busekitoxapogixawosu.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-4/20210904223427862275.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/63635584011.pdfIn PDF document text
    • http://konberdbio.com/upload/files/29867268197.pdfIn PDF document text
    • http://dtjxbpzx.com/filespath/files/20210919042602.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130ae4cb58c0---48907946220.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/6b46ce3000fa603d80ff111742032264/daxagodibobemomipewuzo.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210930232237.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/161471ef68a3aa---61713184889.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/petidadatas.pdfIn PDF document text
    • http://balatonfurediallatorvos.hu/userfiles/file/natorilativase.pdfIn PDF document text
    • http://temdientu.vn/images/ckeditor/files/19216538653.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/sivapi.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/78016191843.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/37736775195.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/23210300630.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/riruzapomexix.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/datutogomedaruzo.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/timabimopenexawofezoki.pdfIn PDF document text
    • https://ms01bet.com/contents/files/luzasudemipi.pdfIn PDF document text
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/2376659223.pdfIn PDF document text
    • http://home-hj.com/up_photo/file/98494826733.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/duboxofobiputuvopig.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/31867548365.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_off0000b513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB513 10536 bytes
SHA-256: 2c86e0e92756a99e3fedba02f6d7d2198ff356c1769cc31c90ddd1e49a67f678
font_01_sfnt_off0000cd21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD21 14208 bytes
SHA-256: d46e59508b7dd063250098e58533956a63ec74f782ae4970f950d1efae063121
font_02_sfnt_off0000f0e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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