Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a8f50e97b183c9a…

MALICIOUS

PDF

109.7 KB Created: 2021-09-02 19:04:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b378aaea7062293a852a4b829dbff353 SHA-1: 8b07fec599b7220db93cb1e66c3d257c25ccf32b SHA-256: 9a8f50e97b183c9a27e09a38ac66ba4343b7b623bfcc2456c2791ec1d84e7ac5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, and the heuristic findings confirm the presence of a link farm and potential urgency lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://libertyquad72.fr/userfiles/file/nuwota.pdf In PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/6ff9ae718029333512f5152c27a486ab/13171902672.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/tufexunutusebelufiwiwaxu.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160990c54d1d4b---62054003272.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021073104160173499.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/16575288092.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/bilotirezijazitepa.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/546d28dd8ab048af121ec8928101a6fd/fokikiwugenewuvezi.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a302c582e8---roredegoseluv.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b932206cfb9---kitixugudodidibagigiwal.pdfIn PDF document text
    • http://oodow.cn/upload/file/210702111234065789h66fv78a6knz.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/fanikomilerububojolisuz.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/37411776421.pdfIn PDF document text
    • https://f-kcc.jp/user_data/userfiles/files/63696433546.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/nuropuxozaduguz.pdfIn PDF document text
    • https://premiumtrade.ro/ckfinder/userfiles/files/28379532107.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/4hld8131m3l4r447r0a5cbd8bd/gemakedarelifamukisoz.pdfIn PDF document text
    • http://philipp-haberland.de/images/upload/file/1138483458.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/6kpm29dobf8ndep61q51f8a0v0/ruzuropifaxe.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/2a64c6eaf551a4c81d9cef3468e7eb2d/xujaguved.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/83498639016.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cq2q8oq6i1nbaqaum4h2u5hbl4/82428399819.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=maharashtra+societies+act+1960+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_off000148b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000160c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160C9 18372 bytes
SHA-256: 562c858437aca1d0bd9646241c4443dbf00486614229024862804ca512c7e53b
font_02_sfnt_off00018f48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F48 11068 bytes
SHA-256: 796ea87666bbae35edd6cd269272d32becbbd5a883c0e4dac0abd621372bd2e9