Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d6d2f622b58adc9…

MALICIOUS

PDF

82.4 KB Created: 2021-09-04 00:47:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 95a91751e1978fb46a4f56b75e3dc55d SHA-1: c1438700d94316cb5661a4a1911fff7b9b3aeb3a SHA-256: 0d6d2f622b58adc9d9b453465f2f6ed9e8d3a1abb9ea19eeb69aec0c1243f041
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to various domains, many of which are associated with compromised WordPress sites or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the heuristic firings suggest the PDF is designed as a link farm to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://synerhu.ru/uplcv?utm_term=marsboy+humidifier+user+manual PDF link annotation
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/83734074434.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/69619963957.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/28664287594.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/xiremuxogewagilav.pdfIn PDF document text
    • http://turksebruiloften.nl/userfiles/file/6672085364.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16096207dc7e1a---fijuwujubekisudef.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786ac9cef0c---21118944563.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-4/20210504082442833675.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/zukigonezaleziwupujalagon.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/9104172451.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be6e83d22d2---kemejobetufo.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/ronoxuzoxokokuv.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/77722418390.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/69148209826.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160760882d24aa---50139896883.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b45527f24d8---98409001953.pdfIn PDF document text
    • http://directartdeal.com/uploaded_files/userfiles/files/rakazifuwapivevogidezujup.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16072aa68092fb---vobaroz.pdfPDF link annotation
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16114c93535e44---54247736057.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608522bd04f82---xowajeviwaluzamefi.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/70b8fookqj98hjk3ec8dkg1qjt/98987470484.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_off0000dc6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6C 10868 bytes
SHA-256: a482219c6f5ecd58dce6f99127c528f76662f17daf525e43266a34475d64e3e5
font_01_sfnt_off0000f54c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54C 17860 bytes
SHA-256: 7d586d77500f911b4212e93d3a845f00e3d6a06355bcd4eb3958acc61f515e44
font_02_sfnt_off000123d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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