Malicious PDF — malware analysis report

Static analysis result for SHA-256 62cd25db763f8799…

MALICIOUS

PDF

82.7 KB Created: 2021-09-06 16:21:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7e3157cde3caa008c5fda216f2f14357 SHA-1: c15c5ef78673817e5f5f41cb2a14b829a80b8c21 SHA-256: 62cd25db763f87991b2a6a7d1cb3c1010ba43e2c24114565c2a841e96b407b75
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to lure users to malicious sites.

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://archism.ru/uplcv?utm_term=adnan+khashoggi+book+pdf PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d29ed1500---munog.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c977da273e---nomozapakuj.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/44ab1f7a51ebf3a28207a1f63c1ea18a/87977495508.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607715aa17ba9---vizegatekar.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/19802700327.pdfIn PDF document text
    • https://isigakizima.net/img/tmp/file/bopamimekatapavijasil.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/kewenarelor.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/cc3a6b139d1fe603545d17a9a31a9075/vopumuzelevunixuvimaruv.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/1688947091611f0b52bd3e5.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/a0814afcc25e18b091c12f829b7789e6/jigekelolirona.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/12423407476.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/digefagis.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/nakebetidi.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd1323cc532---rugilokute.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160705439464ad---33850052574.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/telubudo.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb97ae0aef---lidodesivetire.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/slfecanlsp20h1oo4s87ipp790/jitafazifewix.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/fisorilenizi.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/de82c2ffc6a7e6d4f32fd930085b7e1d/puwunisavonomipoguv.pdfIn PDF document text
    • http://phatnang.com/media/ftp/file/58339039481.pdfIn PDF document text
    • http://zhihepvb.com/upload/ckimg/files/202109031032409776.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/mefevazanodoku.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/femagukonajurelagusefux.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_off0000de68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE68 18160 bytes
SHA-256: 9764e5f282194f4005dccc7d9f20b9a14b73b6ec97dcfa238036254bf3b6ca2c
font_01_sfnt_off00010cef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12506 10612 bytes
SHA-256: 41627d39266acff8b62c26c91abdd53e24fab7386f8e70bab9a7e375deed2a0a