Malicious PDF — malware analysis report

Static analysis result for SHA-256 a25f7c03ebbdc805…

MALICIOUS

PDF

79.8 KB Created: 2021-09-13 12:57:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 321bc357eab4770c530eed6a240e1c02 SHA-1: 9138c68fc9fc0b14fde759cdbdbc30db941df563 SHA-256: a25f7c03ebbdc8057a9ac34ff8b02cefae9a4f8fd8aa21b7f47c473b14e347de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised WordPress sites. The presence of embedded URLs and the overall structure suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://smidgel.ru/uplcv?utm_term=can+i+lock+my+gallery+on+android PDF link annotation
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394ef753e84---76623659953.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/sigunakamogekes.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/noseguxa.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210913115953.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/fuvovewetixufabinelekoza.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name/files/tivetomasaloforisoravowa.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/lowulezawuwabimivute.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/97451781997.pdfIn PDF document text
    • http://firstcuwire.com/file_media/file_image/file/26463772966.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/nomufuvepo.pdfIn PDF document text
    • https://technoarc.net/userfiles/file/dunigulofidubadiluno.pdfIn PDF document text
    • http://mylodge-naoshima.com/fizivijakinu.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/punukisegimemav.pdfIn PDF document text
    • https://valleyrentals.com/userfiles/file/dusividilo.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/maxufebegabaja.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133a8827b0ba---67002534596.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/rixewotagiduxi.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/36636295533.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/u2ddqejlubelp4flprrce0qe77/78571496230.pdfIn PDF document text
    • http://olguanaokulu.com/upload/file/zonuvelapepilug.pdfIn PDF document text
    • https://iphastkala.com/userfiles/file/fizaru.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/liwozazolinumalaxaxo.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/14126179140.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/pakuromoganelajuzadem.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/14840872447.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_off0000d316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD316 17712 bytes
SHA-256: c8a56873360ac3c8edd2bc7a37ee123dd9e644b335bb98488c9c560cae1fd50e
font_01_sfnt_off000100e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118FD 10684 bytes
SHA-256: 4fca837dac02b868053529fd6be8f7dce0474f86b3b932a0b5cd9cbda92286f4

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