Malicious PDF — malware analysis report

Static analysis result for SHA-256 aef9e9b15491104e…

MALICIOUS

PDF

75.1 KB Created: 2021-09-04 06:17:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9f5f4f02aa85c3edf8a9e97c752dbf12 SHA-1: 863abfc0fae48b7f903c61fff2a5d2c35db619a2 SHA-256: aef9e9b15491104ee737fec402f29996eb1b171eb8c5319e6f9ab6eee7d38842
156 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. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of external links and the heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ab256f95c---15573252243.pdf In PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/a80a9ptr8grirmfdpeia3ba9f3/82201579474.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/a6jn94psv3no1d333kd7rpu86t/sevajaz.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcba996ca7---nedusowizetafugedesulopov.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/nofatedofenudasuj.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/31021847782.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/fimupagonutanik.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8a14a2810---laxudu.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750a5c05531---jederowami.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/roveleraxamugubafada.pdfIn PDF document text
    • https://banghenails.com/upload/file/25181186363.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/84845704346.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16124d4c30fa80---4539329135.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8767f04d5c---pasonigebelurutivof.pdfIn PDF document text
    • https://spacio.hk/attachment/file/wivup.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/eb933f7a8fe9fc39bd7d4d8b0f6ff58c/muwisujawowigox.pdfIn PDF document text
    • http://jarosi.hu/files/file/kikav.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/emu7719bbdjaan7s3bm46t9let/12568734730.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/qstv9avksmqdu2mt1tf6brncc4/14725214177.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/lipeburesiwap.pdfIn PDF document text
    • http://allasclub.com/campannas/file/88225639813.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/24294643870.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=goner+twenty+one+pilots+piano+sheet+music+pdfPDF link annotation
    • 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_off0000bff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFF0 17572 bytes
SHA-256: e5985ac4f1e91c893d8c3fbfdc34b9fc8011461c245682266dbae01aebb3f621
font_01_sfnt_off0000ec75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC75 11224 bytes
SHA-256: 208108e9cd7054ec578c2449f2c2d33ff3acd2c4c259ecf2b417faccdd83c0f8
font_02_sfnt_off000106ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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