Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ee55b6f840cb80c…

MALICIOUS

PDF

82.8 KB Created: 2021-09-16 09:48:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 530000d187126a379c9b4fc533060c19 SHA-1: 1d92606ccf823b7574249e938c7fa957750c7989 SHA-256: 7ee55b6f840cb80cd187cad495d0e94494c899b4ad1691124716bbc7d375577a
196 Risk Score

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The 'SE_CLICKFIX' heuristic indicates a social engineering attack that instructs the user to press Win+R or paste a command, likely to bypass macro restrictions and execute a payload. Numerous URLs were extracted, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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=recover+deleted+clipboard+history+android PDF link annotation
    • http://daiichihousing.net/uploads/news_file/kewegibizeripezaxul.pdfIn PDF document text
    • https://tradingcall.in/ckfinder/userfiles/files/gelemofuwifimepiku.pdfIn PDF document text
    • https://fivetc.net/uploads/files/85081361930.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/88009257960.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/lirixogofijajaduken.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/digunemavoxe.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/3736569743.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/ropagitagekuwisifanelejam.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/85669037281.pdfIn PDF document text
    • https://equinox-e.com/upload/UserFiles/file/21719864576.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/midujiraz.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/vunomiz.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/10154710354.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/70189780990.pdfIn PDF document text
    • https://mastirz.com/userfiles/files/gisozibaputimebivagi.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/4b04fc263c69191d0c348d76d3507864/misinejofixavefutizaze.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613c192de23f7---voxogebowurixem.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/luwixemedutokedu.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/56468280658.pdfIn PDF document text
    • http://umhouses.com/uploads/files/fenim.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/53209516199.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140512558b1f---getudaginevuja.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_off0000dec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC2 10976 bytes
SHA-256: 69285c949bd17e033792f56f13ea1f0dce5b2bf921c14f8f13189c5c161140c9
font_01_sfnt_off0000f7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F7 17568 bytes
SHA-256: 733937463dc5d077b096eb703334a6241bb6844010dfd7546565c8e00245ee7d
font_02_sfnt_off00012528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12528 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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