Malicious PDF — malware analysis report

Static analysis result for SHA-256 83de49b7fce15555…

MALICIOUS

PDF

86.6 KB Created: 2021-08-14 05:45:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 435d90dcc08339bc1a6d1927cacd3f54 SHA-1: 6ebd1d65a9d470af9b6d62bc1b54e48ad54f0e42 SHA-256: 83de49b7fce155551543f08f1f1a77d90004ecf1433acca26c991dc2619a8be7
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains a link farm pointing to multiple compromised WordPress sites, likely serving as a distribution point for malicious files. The presence of numerous links on disposable hosting further supports a malicious intent to obscure the true origin of the payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/082eabc32fcf879104ebe3253c96d3f4/94538342934.pdf In PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/baa43f22519685a844ec8616ee44aace/pafuzugodapokim.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160c016e900061---50782683351.pdfIn PDF document text
    • http://telmeed.com/web/ckfinder/userfiles/files/toxefoganovev.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a6dd667b86b---gefipiluxive.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160975cf46e299---69640559880.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/4e9bcecd540ee2e001641fdc4d8b7c22/62682127106.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/f978c83d20973c704cda077fc4c9f9a0/63513965834.pdfIn PDF document text
    • https://clubsportedinburgh.org/userfiles/files/rizonexekerifusiterugu.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/f7a49bc8f44af85cc551398c23bacf00/sewozodizitukamesiji.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/cfeeaf0253ca2ea420c3118998399886/6537006434.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/pmi3sma5c3qae1avdhv8415u50/23993883037.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/ca668d6a800b3e306df6bcc45c8770e3/wurukum.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/91eb39c4f7a552cb78cd3e7b61ed5ae3/waniret.pdfIn PDF document text
    • http://secretlove.ch/ckfinder/userfiles/files/zipitubam.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/18768705972.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b83eee846b4---tagawekesokizipovogut.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b86d1c79668---14568770266.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/sodipoxoke.pdfIn PDF document text
    • http://land89.com/ckupload/files/52367999491.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/93460908346.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/6784047525.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=lwarb+beta+download+apple+developerPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/ddc11de9471c70e3a2f80cf1a37ca7f3/239491120.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_off0000f0fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FA 10372 bytes
SHA-256: c9c4a301561fb5bf2aa3dbe3ee7af2de065807795db0794e70deef1480664bb1
font_01_sfnt_off0001085c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001206e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206E 17032 bytes
SHA-256: 275b8aaa7d791712984e35dbb2c5711a822efcac9e652d4318bfd14ee5d876ec

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