Malicious PDF — malware analysis report

Static analysis result for SHA-256 827825032422bf05…

MALICIOUS

PDF

74.1 KB Created: 2021-09-07 13:57:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e1a3f8fa8031bbdf1b7e5c5b333ad92d SHA-1: d36b39d9c5cf2cbfc3b77150cfe2664d2b03ba33 SHA-256: 827825032422bf052668cdc802f664371e75cf2eeec9fc5e2ef336bb52b92de5
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this assessment. While no scripts were explicitly extracted, the nature of the embedded URLs suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://pistant.ru/uplcv?utm_term=basic+introduction+to+computer+pdf PDF link annotation
    • http://vivaibonomo.it/userfiles/files/3792740683.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/cg6t8i23r0bg4s83lltbgje5c5/lotevabezu.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c199e743f3---21699831373.pdfIn PDF document text
    • http://gat-asset.com/CKEdit/upload/files/30848393011.pdfIn PDF document text
    • https://nenanhduong.vn/Upload/files/46857176617.pdfIn PDF document text
    • https://nomortiga.com/contents//files/96076083935.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/pufafer.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/93760325180.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/3d68bf614bb807051586fac296e1a850/bifowonafit.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c4a5ec746---71211713372.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/06/file/12243811262.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/xivijixofataje.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/domux.pdfIn PDF document text
    • http://djpress.pl/Image/files/68486354502.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/91931220967.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608772e6d050e---bizozukexuxetosexibaj.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/40928864166.pdfIn PDF document text
    • https://sapporopools.com/contents//files/zupikolukazinusudon.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160e23ec857621---jevigiz.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/48084238059.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099f6a5a3f57---48017247200.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/24804552364.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_off0000bee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEE2 16732 bytes
SHA-256: 51ef545b45f96f5af28579e0353f528bfeb1a882be733d6d3a28adce80099a57
font_01_sfnt_off0000e9cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CD 10888 bytes
SHA-256: f454b4a9eb80273721456b3b168770479bbdf8bfb038d2e956403d81a39ac486
font_02_sfnt_off0001030b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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