Malicious PDF — malware analysis report

Static analysis result for SHA-256 08988a6d6fe71f4e…

MALICIOUS

PDF

81.1 KB Created: 2021-09-15 12:49:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6c6a101de77b13ec43d76b8308bc76c2 SHA-1: 911308ca6466f3fe68278a046c130527dcf06034 SHA-256: 08988a6d6fe71f4e620b93ef26694862a7ccc37a812a88e8752bd9ffdc9e3a3d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with compromised content management systems or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics suggests the primary goal is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=android+data+extraction+from+dead+phone PDF link annotation
    • https://vnjhanoi.com/upload/files/komojekunozug.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/sidimelorojukexin.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/93607537502.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/vakupezutolizive.pdfIn PDF document text
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/zogupoxezoku.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16134138e202fd---82336089618.pdfIn PDF document text
    • http://skncn.com/u/files/vipugititifubabopejuvub.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/gopufineritowis.pdfIn PDF document text
    • http://potya.com/36115030053.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/98184838591.pdfIn PDF document text
    • http://esistore.lu/userfiles/file/45119690744.pdfIn PDF document text
    • https://shoppe.everybodyisnotdoingit.org/gift/userfiles/files/vefogidopix.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161306c1898a13---88341994247.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161302f405108c---fasixuvubivitonaduxaguli.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/64056468964.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5eed91e07---fatanexevogubupofozimij.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/xuwopepomokoza.pdfIn PDF document text
    • https://lomasdelaweb.com/userfiles/2008.09/file/jegatevejelel.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/rirufiwagokudawuwatumoxap.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/91676553419.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/35496571713.pdfIn PDF document text
    • http://kbfrutos.sk/images/_file/getonoxegivimebusesisida.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/xujavegojolagisajukewiz.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/gawuwebovupaforeregulu.pdfIn PDF document text
    • https://sleepthai.com/piceditor/file/44359684303.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/11997725643.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_off0000d946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD946 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f15d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15D 10752 bytes
SHA-256: f52ec82ed57377e59f5a3b3d97f607bc2d4c3e8e4f4f595f4224b86272d7454d
font_02_sfnt_off000109db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DB 17368 bytes
SHA-256: 8e49b942687994f4795cb326c652b34f51728612b8e815d76fd9ef026c0d7abb