Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a15c6f047f54517…

MALICIOUS

PDF

89.9 KB Created: 2021-07-23 23:05:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a684f416648423871e3cd800d1970a5f SHA-1: d96562bca0129f5a50dfb6552247b8550906c3f7 SHA-256: 0a15c6f047f54517836a143769ae48343e4ac0949643c19293632d24d20d3908
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of external URIs and link farms points towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://abc-tel.ru/data/File/49891263846.pdf In PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/tosodirudo.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/tokofupaduxinenesaki.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/6d3fb764e56124338fb4b73ad3798ef4/21078845834.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/noludixolonusufe.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/16079380016.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3ea7d3810---41206368542.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3ad64190d---97993797807.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1609722779025c---22225777953.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/86958547267.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086f726938a1---fesoxivubataguf.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/1b0395f832be87b0bc07b6916c133e58/25960401436.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/55884865604.pdfIn PDF document text
    • https://bem-sa.com/img/file/zemalowajufuteni.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/lejesakovuko.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/sovutopipiloverabu.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16087405d47f2b---rupodona.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/32259127514.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b79148b88dd---31320933166.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/8577a2428c09513494e5cfd963eba959/darekolivasarudixorazu.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d86a5c74a---mudodojefafelobipavaroz.pdfIn PDF document text
    • http://deforma.it/userfiles/files/68210378500.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/828a6cf57bff64700f8781f2cede6d15/lovabi.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/855544cc4439d2714554e28e16d842e6/9061409699.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/zadefuwifilamujegis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=paganini+caprice+24+cello+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_off0000fb74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB74 10728 bytes
SHA-256: ca0688086e04ed012cf1cc4e2d5984dc041cf2434ba3c740a7fc8c991666ee24
font_01_sfnt_off0001140b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1140B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1D 17060 bytes
SHA-256: 3038043c755492e46051dbb6866cd49aa19c110d3356a00c2db677d8d921cde5

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