Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2296c1ef30dd3f4…

MALICIOUS

PDF

82.3 KB Created: 2021-09-14 02:37:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 57575ce99889625b5ea23aec39f3e7e6 SHA-1: 78c64d594adc659f1e300b768b1908756ddab331 SHA-256: a2296c1ef30dd3f4b136e41a7ddf3785bc922405d49894957d7bf1774a814d4d
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it's a link farm on compromised or disposable hosting. The embedded URLs, such as 'https://pistant.ru/uplcv?utm_term=xbox+live+android+games', are likely used to lure victims to phishing sites or download further malicious content. The PDF structure and link farm nature suggest it's intended as a delivery mechanism, likely via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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=xbox+live+android+games PDF link annotation
    • http://kpdb.org/userfiles/files/75241702977.pdfIn PDF document text
    • http://www.kingsmen-cmti.com/upload/files/10414247813.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/gurozugagos.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/jigoxerudalopajubegejibit.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/79811099876.pdfIn PDF document text
    • https://learnrkbin.jugalbandiresearch.com/ckfinder/userfiles/files/lulopiruz.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/8881019263.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/vokitalimubuwizele.pdfIn PDF document text
    • http://win-sonic.com/ck_imgs/files/25586414570.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/lubonojaxuzevofe.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/48v9m9cusgn0vmrm1rtipju1vs/11827049227.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/3quluvoitrb1d19fjttd9b9g14/bakebubiketizudibuk.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/tobibolikobawo.pdfIn PDF document text
    • https://ebus.myskoolapp.com/FCKeditor/FCKimgUpload/file/67594434644.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/tineve.pdfIn PDF document text
    • http://gloteckr.com/upload/editor/file/12536801721.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/22605791350.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/fudopexusuv.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/werisomupeju.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc12eb60bb---suwulixukigox.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/18591696553.pdfIn PDF document text
    • http://navrattan.co/userfiles/file/13676074279.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/67236941247.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/xedawefofu.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_off0000da44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA44 18552 bytes
SHA-256: 0e2f0bb07f78d8a6dc69a2ffa9fab58453fc0b459c3ecb31778830fca4b828f3
font_01_sfnt_off00010aaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAF 10808 bytes
SHA-256: b5bc477c83174ade1d01c4149a89c71eb8d7e01f27f889314d9d8464848ed581
font_02_sfnt_off00012350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12350 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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