Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea321c0c23329765…

MALICIOUS

PDF

84.8 KB Created: 2021-09-10 05:01:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8dd073a3f532f9f20d9326a90333228b SHA-1: 7e369ef7c1fa3c9fab54744edcfa1d3e5d6a92c4 SHA-256: ea321c0c2332976523bfb70ac338104aa06fa8bc028518dad7752db06da55db9
196 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. The 'SE_CLICKFIX' heuristic suggests a social engineering attack designed to trick the user into executing a command. While no scripts were explicitly extracted, the presence of numerous embedded URLs, many hosted on compromised or disposable domains, points towards a phishing or credential harvesting attempt, likely involving a malicious link or document download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://revucue.com/ckfinder/userfiles/files/77437473212.pdf In PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3bdb049be---6584824794.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/458984c86226aa309af48d5f62b71375/63328674476.pdfIn PDF document text
    • https://stvorki.ru/files/file/kojovadutasilulixebiduxow.pdfIn PDF document text
    • https://aedwea.com/upload/foto/nujogipubelize.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/mevorajufoxunopoxewogu.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/36756875098.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/78551799160.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/dolimu.pdfIn PDF document text
    • http://greensquares.in/userfiles/file///govipewizovi.pdfIn PDF document text
    • http://halongwave.com/userfiles/file/lelowib.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/zerifuxibetad.pdfIn PDF document text
    • http://wdnederland.nl/file/39029113686.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210910_052615295AF59133.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/95307377219.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/nopaselajogiwiwuxa.pdfIn PDF document text
    • https://rossbeede.com/userfiles/file/risomofabexedexa.pdfIn PDF document text
    • http://dc-3ed4d7413bdb.prshots.de/uploads/userfiles/1630897743/files/26349689298.pdfIn PDF document text
    • http://zzquansu.cn/d/files/fiwuxufubugiralurelomet.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/gituxurulubopalu.pdfIn PDF document text
    • https://pbpkrosno.com/fckfile/kisakawizusigunuv.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/75865350906.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133161071c05---nomiwifudemijavigu.pdfIn PDF document text
    • http://ned.ru/uploads/files/91488523936.pdfIn PDF document text
    • http://ckud.handysociality.com/upload/files/zobobidalaxixetolukix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=mened%C5%BCer+zada%C5%84+androidPDF 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_off0000e74c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF63 10212 bytes
SHA-256: 0a17ada2aebab552c316c13bc3b03833cd4e69cbdadf898d1939cf02a283d4b7
font_02_sfnt_off00011600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11600 18104 bytes
SHA-256: b7c196182da8d96bc6ef6ec3cdeafa47577f11d58d493e197e69bfa6d0e04147

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