Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f5d3e09bd4301f1…

MALICIOUS

PDF

83.4 KB Created: 2021-09-13 09:34:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b7644b79574a8d502f4a1487123e972b SHA-1: c3b85f8e6128edd504a4c780031df44c66319388 SHA-256: 2f5d3e09bd4301f182b2920185bbff860c395f0ac88cf4781ed83aa8c8d1a121
164 Risk Score

Malware Insights

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

The file was detected as a malicious phishing trojan by ClamAV. It contains numerous external links, many pointing to other PDF files hosted on compromised WordPress sites, suggesting a link farm designed to distribute malware. The presence of a visual download button further supports a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crysiq.ru/uplcv?utm_term=roposo+apk+download+latest+version PDF link annotation
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc67a88693.pdfIn PDF document text
    • http://hpcad.pl/Upload/file/72538225449.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/7860900268.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/detabowunukugitopisa.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/pomuv.pdfIn PDF document text
    • https://ice-group.pl/userfiles/file/donogibawifuzuruboxud.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/kikilekilerujovapin.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/8116913341.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/xavorakavezafetumidorozer.pdfIn PDF document text
    • http://aorganboys.handyfriendship.com/upload/files/27246928893.pdfIn PDF document text
    • https://esperidiaogomes.com/userfiles/files/83461201433.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/pirukonulowoxebi.pdfIn PDF document text
    • https://avenue102.com/uploads/file/fukenoduzatusal.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/binokopaminusezetikulaw.pdfIn PDF document text
    • http://gro-felix.si/uploads/44041004119.pdfIn PDF document text
    • http://smirna.pl/files/file/pojodijuwexifi.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/42117429812.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/40399939748.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210903103514.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/remevuguvija.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/b82ccc679bc005807ed9ec0dad321a69/25928633138.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c3ff08ba1---85222676074.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/95708725527.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14674435335.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/tosavomubarujifepuzi.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/90954496720.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb01c86862---85825007815.pdfIn PDF document text
    • https://timminsrenovations.ca/file/rGY8Ufj9FQJh42Je.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_off0000de93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AA 10672 bytes
SHA-256: e545591653c3d08d98482ef4aef272c9fdd33debdf82725160b05bed55df398d
font_02_sfnt_off00010f55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F55 18624 bytes
SHA-256: 7e80dc64ed359eaf46bc1fc8dde0480986c73ad9c1c6b812bd217fe45b659ad6

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