Malicious PDF — malware analysis report

Static analysis result for SHA-256 6daf6b53385cee4d…

MALICIOUS

PDF

86.1 KB Created: 2021-09-05 06:36:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3a114538dceb5cbca148488a98062f45 SHA-1: 118fedf0c1173704ad6d0bcfe6852cae56fa891f SHA-256: 6daf6b53385cee4de2289f0bec0c67b1a9348ad70e2d59eec9653338eb1c564a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or SEO poisoning campaign. The document body was unreadable, but the presence of numerous external links is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cructi.ru/uplcv?utm_term=english+cartoons+for+learning+english+pdf PDF link annotation
    • http://ddaengshop.com/ckupload/files/86079010444.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/rivapar.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/nidana.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/wovimivizuxokugixorepajo.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/lron5ijglps81i2suj4o8dvb50/xevizisopifuguxuto.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba69ac01b11---pimusakirevemoxowe.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/roruteg.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/vawege.pdfIn PDF document text
    • http://caryhigh1987.com/clients/41333/File/zajunupatixujubitufu.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/texokut.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/20251539848.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609313357ba89---gikagafi.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/uni2fbitgsru9fgr0m2pp0ktqs/28258650712.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8aeb401959---76618882837.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/e6ebirkctanocr4f1qlmp8bne9/55436793380.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9265b038b1---tetululada.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/kedoxojetovovitijekirorez.pdfIn PDF document text
    • https://atlaskvartir.ua/data/uploads/files/gipixomevilo.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7371acd88---27071967477.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607bff1fd030a---42668920369.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/unhh6v7ac4vdtvddt54b2qtsr2/87045741771.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/29471167651.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/kutixowadu.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/750884abf1916b78ab9ab36383847cbc/petokowip.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_off0000e8a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A8 18408 bytes
SHA-256: 8ef23ad43675700c8a84dfc190b80511109d9a42763d2ccfa7fdcb11bee99f7b
font_01_sfnt_off000117f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001300e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1300E 10884 bytes
SHA-256: a9e1c166da885f0d5fc7db8abd1938b12c858aabb51bdd82c5d01416ba074602

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