Malicious PDF — malware analysis report

Static analysis result for SHA-256 b830b80da8216942…

MALICIOUS

PDF

71.5 KB Created: 2021-09-05 03:13:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 7470e3b26ad8ee5915a7dd5e1085b83f SHA-1: b33ce898ca4222aa0a4a11c6a8b325ef52a6ede5 SHA-256: b830b80da8216942eccdc23a7223a87df25d2a8d82bbc5a4fad827063460a978
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains numerous links to external websites, many of which appear to be compromised WordPress installations or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly suggest an attempt to exploit users through deceptive redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://drafthe.ru/uplcv?utm_term=ratio+and+proportion+worksheet+for+grade+5 PDF link annotation
    • https://soalmatematik.com/userfiles/file/50855838827.pdfIn PDF document text
    • http://dorapeyzaj.com/userfiles/file/bajowiliparutejotukutare.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16116974f1185d---vimaj.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161087ee4d8525---pufod.pdfIn PDF document text
    • http://medica-brno.com/files/wavujep.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/928beff8aaf658a5d4a9604e27161a95/60837644039.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/91477462415.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/e0e5929fcf8d77f6edf443763ddc5594/49058359900.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4cbf662ecf461a936902b94f151703e4/24389657090.pdfIn PDF document text
    • https://tunhuaduytan.com/upload/userfiles/files/morimuw.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160982738bf664---xogafidiboxefubabeti.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16087ba069004e---47852364339.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/q0r6qneplkqmdmpqvodpdianu3/68338050687.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfcffc9af7---lazazogeninomibeja.pdfIn PDF document text
    • http://coopmong.com/ckupload/files/33775687376.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/40008861940.pdfIn PDF document text
    • http://drwatsonsr.com/clients/2/2b/2b9a0cf27321ceab3a47fbd10bf94d34/File/mipifidokap.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/wuxofu.pdfIn PDF document text
    • https://braveathlete.net/geektic/files/bapumut.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/35399903362.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608842f372f59---kurewigituvimere.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/61mpdhppe9nfijiq5tf89cf67v/lamijekafimujovagezujobu.pdfIn PDF document text
    • http://greaterdeliveranceministries1.com/clients/61527/File/tesebegimewenisif.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/atfj843rpjvfho6g3cktj42al1/ganupaxeke.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4b6b60013638ff249b13bf4d1a54f342/gefutupevida.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a875c3be614---84408975842.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2be1e127df---navodigoriwakuxiduv.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_off0000b914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB914 14816 bytes
SHA-256: 63a8778baf4b010ad7e2353be528bdd0e1e50a04014efb0fb16f98eeacdfeef2
font_01_sfnt_off0000de25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f63c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63C 11088 bytes
SHA-256: 2defdaccb9447f2ffa2eaa12c044a7e4f660e4e2b82422c2985e9484d531c5dd

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