Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8298e15e033e888…

MALICIOUS

PDF

103.6 KB Created: 2021-07-17 18:10:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dd8d225ec39899a1e077d61e78d99d22 SHA-1: 26c7cb69edf6f5d251a667c6f588d512ea4cf9f7 SHA-256: d8298e15e033e888b126f803cebe0b986d2b30e17faf384a548c649b84668511
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress uploads and other disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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 http://berallebags.com/UploadFiles/FCKeditor/20210508232012.pdf In PDF document text
    • http://angelescare.com/userfiles/file/nodajikovodafi.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/kasilukagog.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/giwaduwizebutofijopufu.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bad4f7303e4---29638983013.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/2fefb61007b69b6a509b2db8af44c82d/nokajitejixuzogikibidiwo.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f76072c7fd---93305206861.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/98013526073.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/fixoxonepufadojomiket.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6addd618e---pumozo.pdfIn PDF document text
    • https://flyags.com/editorResources/file///59819229227.pdfIn PDF document text
    • http://feast.to/upd_file/dujugezogutexumi.pdfIn PDF document text
    • https://loctra.net/userfiles/file/kivutojorajerororop.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/22667181833.pdfIn PDF document text
    • https://antae.be/app/webroot/uploads/file/81812933269.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/c99976260b618dd8a038930cf07e4ac0/supizejipuxevaritov.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/c01uj9v07b77v4bkjrv0krfbj6/wifefegudozemawaraka.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/pobufobosugodow.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/papusug.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/5cb5be686d30974c8c1495ff67cd43cd/77557319986.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074471a50826---pojojopatujosaribedosore.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/dvhdpa365cch4cs5nmtdipc8in/38082529982.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607880817f227---gatafojemodijatusegep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=other+word+of+easyPDF 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_off00012fa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA1 10436 bytes
SHA-256: d066c57cecaa3e1756ef14895ae08d2112ec5d2963d2341679200cff8f2c79eb
font_01_sfnt_off00014796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14796 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015fa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FA8 18384 bytes
SHA-256: b1ec7d31d39ba1ab8d877b384d1f4ad28d6a2844b801edb758e053ad643fc0df