Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea5d0dcad6d237d5…

MALICIOUS

PDF

80.2 KB Created: 2021-08-16 14:26:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 39e7d1ea18edc8288bf603ae2b1728ea SHA-1: 475c4ecf3d70a8481e06dd66dee2538e8bc9834b SHA-256: ea5d0dcad6d237d561d529f34693e484d29ebc305af14cfebd95fe636ca4bce1
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=finite+element+analysis+notes+pdf+download PDF link annotation
    • http://china-hold.com/UploadFile/file/20210705143650151.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/gefozudimu.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb6a93a9d2---77108746389.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/ba3980d5110b94031a78f3a9b6f85730/dajudabarudekuturelarijum.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210529171205.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/nopagisise.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/wemevoditabizesufiwubewod.pdfIn PDF document text
    • http://dlmberatung.ch/userfiles/files/jebekarijutafaworut.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb4facb65c---77981586170.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/bef81e6c623eaed42d6cc020daaa65d8/tumepus.pdfIn PDF document text
    • http://mrbossamktown.com/uploads/files/39502925463.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/9071511407.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/61tck52fdt0451kndmnjdma1n7/26638101191.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/81d21c2b6432f738a978127e17b61a99/89620872615.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/lorixosi.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/73507399605.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/nazolerofona.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160774a80de23a---90004922364.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3645da1d6---dabovakijirunararumuxu.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/vmtflhhg4uf6m8tjod0jt60i67/rabonamobabulid.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/45734672798.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_off0000d907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD907 10736 bytes
SHA-256: 07cf73fcdd60586b071fecd07d8a7172397626b9138ddf5192fe6a77dd48a7b5
font_01_sfnt_off0000f1c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D2 16020 bytes
SHA-256: 1b7fdc8b8c8e425e6ae50da1bbbdea3f6ebeed96ad17cf9a0d2608d4d72457e0

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