Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c03c8c462f0345d…

MALICIOUS

PDF

93.5 KB Created: 2021-09-01 01:44:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 212e81d2da4305cf4f7bbf911a1396ad SHA-1: 357619d288f27a3caab4824b43a2341d35ed13ef SHA-256: 0c03c8c462f0345d884a839c80691a8f150c875971ec1cb4b11110f0894b94fd
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to compromised WordPress upload directories and other domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://nomylo.ru/uplcv?utm_term=chord+formation+chart PDF link annotation
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1610c8d086189c---zetalomukatapononuj.pdfIn PDF document text
    • http://denledmpe.com/upload/files/13308310112.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/zamokinafegesajef.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/pasapege.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/kptgpdhdauatcu1r7892bn28m9/57555063049.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/vebukivudob.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a7ede20a3---56657534359.pdfIn PDF document text
    • https://businesslife.com/content/file/11849063474.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/86509343213.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/rabatedimufopadulofuz.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d428bec09---pojuf.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/38247645837.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ndaes4b2lo4j2qjcgche0lj7v0/vinomuxapafazabolosomew.pdfIn PDF document text
    • https://shidoremicrosys.com/media/5160874482.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/salugejapavizigido.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794b8aaa24c---luramenomurogunu.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16100178f23c2d---tuxirufiwesapogu.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610b0847145e3---44160522102.pdfIn PDF document text
    • http://focostrade.com/files/20210611092022.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/tapoweku.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/35278062715.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/e35f2c4b3cb37d7f543676cb55798fec/zujimaxalemudovaku.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/4a3a5316b44327677355c1de703d1e10/47375811542.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611f258990c39---75892209139.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_off00010844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10844 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001205b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205B 10428 bytes
SHA-256: 7ccb1b2395475f8acc1fc5cd4248967877a5e08a3baabb511079f8ee26096e1e
font_02_sfnt_off000137c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137C9 18772 bytes
SHA-256: 6c94567bc367536c029bf72453f45332b08121fd0637209f88fdceb007849e1d

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