Malicious PDF — malware analysis report

Static analysis result for SHA-256 e828ccfb4c109164…

MALICIOUS

PDF

84.6 KB Created: 2021-09-05 10:30:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5fa7e81bf151163e0c18d412859109c0 SHA-1: b756db3b856ef10e2644d3fc3c6452810e8002ff SHA-256: e828ccfb4c109164e22c52c7883ab26e9defa5f013df4148a1b3a0a1d11f12fc
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites, and one specifically uses a 'utm_term' parameter suggesting a lure for search engine traffic. The heuristic firings indicate the document functions as a link farm, likely to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://garglob.ru/uplcv?utm_term=trials+of+apollo+the+tyrant%27s+tomb+pdf+online+free PDF link annotation
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/r0okjq7dohn2euk8lrac8hgfk5/getizafamaguvakiworul.pdfIn PDF document text
    • http://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46499987475.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ad9973868---95820654236.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/h0nq5acoq1cojh86o2g2tjfatf/jalaniketodoladuge.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/57fs03hi11ps28jcg9btktba14/16456309575.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/61486277924.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/72858be4d0ac998dc41bcff9532f00ec/15693743734.pdfIn PDF document text
    • https://transit-connection.com/userfiles/files/95261301266.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/10160101862.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/17466196620.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/3235438f4a4759d3d8ae92a7f0584f8e/42090040212.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/64638158817.pdfIn PDF document text
    • http://hhs63.org/clients/8/88/88ec95b665b56da82b1de85f097fba10/File/kelonubigola.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/mapura.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/e488b6f48ba05526be76a24ef4106cbb/61652965988.pdfIn PDF document text
    • https://www.nickelmarket.co.za/includes/ckfinder/userfiles/files/zebegaz.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/jejovida.pdfIn PDF document text
    • http://lynhuagiasi.com/Images_upload/files/muvulazukarusumi.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/1267kua8jsqpdl9i5qo75h42s7/lipufu.pdfIn PDF document text
    • http://placc.info/up_image/37060856133.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/xinugujuwi.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/feruzepatugudojabudo.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210802084329.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/24473351938.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_off0000e49c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49C 18044 bytes
SHA-256: cb5095173a4e60809e742867a4bffdc597323882b77168b6a96b1c687a532e77
font_01_sfnt_off0001130f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130F 11016 bytes
SHA-256: 1930f3e846b2bdd7b20295e385cf7cad5d700da18ea02d09f5fc6e309abb0bf9
font_02_sfnt_off00012c47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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