Malicious PDF — malware analysis report

Static analysis result for SHA-256 f38f4582eadd86dd…

MALICIOUS

PDF

70.0 KB Created: 2021-09-28 00:06:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bc18c75964e0f64ce73b002df04d8d58 SHA-1: 21ebfcd4d0edaff0300837b1033cc54dbb76803a SHA-256: f38f4582eadd86ddf690a7be8d500c534f4dc7504f3915d89a09119f9bd987ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, many of which are hosted on disposable or compromised domains, suggesting a link farm or phishing lure. The presence of these links and the PDF structure strongly suggest an attempt to redirect the user to a malicious site, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://suacuachuyennghiep.com/uploads/files/kuvosimubulo.pdf In PDF document text
    • http://edu-soft.ru/site/htmlimages/file/tafubakuganedezusunigo.pdfIn PDF document text
    • https://kozlovka.mebel18.com/uploads/files/6479577836.pdfIn PDF document text
    • http://www.veslovani-vsb.cz/soubory/file/tatogoxo.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/zarokesudupul.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16145f9012cb00---vigutu.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/23027283827.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210908_016BDEA936BA52A8.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/e8308f8237975e2c6af32aaef0306db5/8400162174.pdfIn PDF document text
    • http://borisovhlebprom.by/var/upload/file/31329084577.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/75191203838.pdfIn PDF document text
    • http://megatex-plast.ru/pub/file/valoraj.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/fixujuwanewamawadaju.pdfIn PDF document text
    • http://reckdance.pl/userfiles/file/lolegevotid.pdfIn PDF document text
    • http://slxiang.com/v15/Upload/file/202196622234141.pdfIn PDF document text
    • https://webmanagement.colortown.ro/images/file/54788583417.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/e30fe49474b1037b864b80f4d1ff78ac/jepat.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/e0727abea1422a04568be1c6f99af14a/bexozudijadapujedo.pdfIn PDF document text
    • http://tomgiongvip.com/uploads/files/file/zoxerit.pdfIn PDF document text
    • https://jung-yeunjang.ch/userfiles/file/pekasowutenovovebagur.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/41477486900.pdfIn PDF document text
    • http://konberdbio.com/upload/files/lavegaguwu.pdfIn PDF document text
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/10877713629.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=talking+tom+cat+old+version+apkPDF 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_off0000ae21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC633 17024 bytes
SHA-256: 09804cc2c1af30e977af968d58a176eb6a298a451621141f634f22bed142c182
font_02_sfnt_off0000f15b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15B 10976 bytes
SHA-256: cebf96e9473979f829d7a036f844c0c41987221c9e13576ca31f79fdfd0d281c

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