Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d84dc73b19577a0…

MALICIOUS

PDF

95.7 KB Created: 2021-10-05 22:38:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2d38655e100f93d3b2bb1a3e69cca451 SHA-1: 25eeddc1062f21015667b4a131c2fd15b071cb67 SHA-256: 3d84dc73b19577a063007e389eafe8d3ea71a27b741d82f2b069fbfdd7319913
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to external sites, some of which are hosted on compromised WordPress installations. The presence of a 'utm_term' parameter in one URL suggests a potential phishing or SEO manipulation tactic to lure users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://pistant.ru/uplcv?utm_term=the+secret+life+of+pets+1+full+movie+download PDF link annotation
    • https://suncables.co/images/file/degakefatosobadutu.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/86597551606.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/49060593854.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/61644761969.pdfIn PDF document text
    • https://korzo-galeria.hu/files/file/4598035936.pdfIn PDF document text
    • https://hosrem.org.vn/ckfinder/userfiles/files/58752211516.pdfIn PDF document text
    • https://univerosg.com/ckfinder/userfiles/files/wavilekasisedilavawufevun.pdfIn PDF document text
    • https://tekstilkent.formenemlak.com/upload/ckfinder/files/69810268118.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/f8bbfe9f6eeff4407755a2e84ec4fb2d/vigaxotuteri.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/nizemikemapisumudapijoge.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210906163096567380.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/54710793665.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a3ffc8728---xojiropewidufovomagug.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614339bddd8f0---76025188734.pdfIn PDF document text
    • https://naveenent.com/administrator/imagetemp/file/55766175700.pdfIn PDF document text
    • http://gpsputhuppally.com/userfiles/file/wokagupogek.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f26fee44d3---gubenisopoxajev.pdfIn PDF document text
    • https://doan295doson.vn/namthuan/images/news/files/10124284064.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/vuperanegul.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/bofirigijavitulifewelad.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16144146c90532---42659746769.pdfIn PDF document text
    • https://ikima.fr/uploads/file/85785718562.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/lidoses.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/nununubug.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/lanerorid.pdfIn PDF document text
    • http://mexxeopaint.com/upload/files/jewatetelubosevavar.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_off00010dde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000125f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F0 18772 bytes
SHA-256: 63193cadf309cc1bec564f89126aa7f844c9a2b66cfcfc3f492b3668cc2868e5
font_02_sfnt_off00015685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15685 11152 bytes
SHA-256: 57892f59186bb9c479dc6c4863c51249d716388f76b9b284e85cf6615d812e67

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