Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a45612ee1053cce…

MALICIOUS

PDF

86.6 KB Created: 2021-09-01 20:32:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f54fd264b72be8015abecf3b0b93ac4e SHA-1: 20be21b2adfc5a7a3f718190d1a1814e6747f343 SHA-256: 4a45612ee1053ccee6b6706e47bcd7e7327397210122f03a1edf51f30f7768ee
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on potentially compromised CMS uploads. The embedded URLs suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://pcccmiennam.com/media/ftp/file/zegekevibogodomumijilodus.pdf In PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/qdqa32479ebnh6d9b43q28ob1d/21420419506.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/43338561733.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/zasidibepe.pdfIn PDF document text
    • https://menokatea.in/ckfinder/userfiles/files/85526002273.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210803143333.pdfIn PDF document text
    • http://cloverdiamond.com/file/rarim.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/17884202894.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/kisojekote.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/e4a3fdc48dd6d4613e5b40d79ddd6e8d/nozovaf.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/23afaef55a53294f85663c126405eea6/lapenutesokakulo.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/soxatu.pdfIn PDF document text
    • https://anfauglir.com/images/file/zaxolisamivepumek.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/c09eb9e7d919d7c72dfeaff027d770c7/21431431767.pdfIn PDF document text
    • http://sweepinstyle.com/userfiles/file/viluwoteki.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607be6c6ec9c3---452905151.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3201311c95---kutarejojivo.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/mazodewuxolig.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab97599ee6e---22882075838.pdfIn PDF document text
    • http://cobmedia.hu/include/61821471085.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/18472322315.pdfIn PDF document text
    • https://vili-al.com/uploads/wysiwyg/files/puvujevuweb.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/81587477111.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=gritting+your+teeth+meaningPDF 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_off0000e337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE337 10592 bytes
SHA-256: eaacebaac1edfba3be9ff8193b866f451d96ed5dd376784433328c17d04831e2
font_01_sfnt_off0000fb47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11359 20908 bytes
SHA-256: dde6f414710e427dc6ca6856e0c3428468d47bc13647c38ddc4862a356145a4e

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