Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbb9cf53f6bd1978…

MALICIOUS

PDF

69.8 KB Created: 2021-09-12 23:06:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 117da9b0b93f9e18c7ec78d1ab923483 SHA-1: f58f66cdb56adafaf97372d9b594a72c27d80f21 SHA-256: dbb9cf53f6bd197837159c060b6255a4148b386cff3168c348d1006701982709
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous embedded URLs pointing to potentially compromised websites and disposable hosting, suggesting an attempt to lure users to malicious content or phishing sites. The presence of external URI indicators and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=free+minecraft+alts+unbanned+on+hypixel PDF link annotation
    • http://paneldeconsos.com/userfiles/file/42851364136.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613df1f47eacc---vutanotovesemudubig.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/72237139227.pdfIn PDF document text
    • http://kgmda.com/upload/files/73303283291.pdfIn PDF document text
    • https://anjingliar2.com/contents/files/78224202530.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/zebunomepunulosokum.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/wijerobufew.pdfIn PDF document text
    • http://jianianhuayule.a9188.com/upload_files/art_files/files/20210911_150410.pdfIn PDF document text
    • https://ckmandarin.com/uploads/dilekobitepap.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135cb0921dd0---naravagusenexegefuwopojus.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5986d12b1---dujewa.pdfIn PDF document text
    • http://aallergy.netlovestories.com/upload/files/69239513844.pdfIn PDF document text
    • http://joyandwowbook.com/upload/file/20937039312.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/50383740434.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/nazosupirudekepudujus.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/16406050774.pdfIn PDF document text
    • http://gojjang.com/uploads/files/85476555771.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/tedanofedipalek.pdfIn PDF document text
    • https://limsurdua.com/contents/files/88388391260.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/82909409453.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/84095453924.pdfIn PDF document text
    • http://hongdacable.com/d/files/runisuxo.pdfIn PDF document text
    • http://ukrkarta.ua/fckeditor/userfiles/file/suzubisizimufuwunipamuven.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/juvafekedetudanabu.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_off0000b199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB199 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9AB 14936 bytes
SHA-256: a0688ab443f05cbd50e827a8e17fb72ce401b7cba19f8346c2ccb5e39cb14434
font_02_sfnt_off0000ef96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF96 11320 bytes
SHA-256: dd1a8497806fa8b2f71e1d020903738238ed38d9a741c92c834cd929aa69393b

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