Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7f1546b659631c7…

MALICIOUS

PDF

81.6 KB Created: 2021-09-04 09:47:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 598e77fa43cd21731f11b89c8629efb1 SHA-1: 01315b7385ffa49243ad995f114b399608072c8a SHA-256: e7f1546b659631c771ee019ad8f9015a71f87ca9aec319f083a8da3ae7bad3b0
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised or disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The file's structure and embedded links suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://kidneystonetreatment.in/userfiles/files/dajawedizubiz.pdf In PDF document text
    • https://pharmnet.cz/ckfiles/files/files/7599011059.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/282e6bbe999ea1f98e0856d801f63558/nanolufujidej.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/bcf74c8ee2950f231e9ce37168b26dad/lalidotuledituligutere.pdfIn PDF document text
    • https://buka.ru/sadm_files/7329799558.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/52212114792.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/a9e026ae1160ff0a4771ca58e01ba1ad/11878165556.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608038bfb053b---32803596666.pdfIn PDF document text
    • https://nasikampung.info/contents//files/19596494250.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd524c7c63---41409472691.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/56052252339.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/d045736fc1d22dd362ff70737218eb1e/gebapefawititiza.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607166620b9ae---66279198555.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/fijojazuwakekefatunufer.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/b85c5110c58a1ff108a8d12b36ca83f0/jupida.pdfIn PDF document text
    • http://e-store-sys.com/userfiles/file/vumum.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/wigepibobariki.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/fodibufigawixibebapapij.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/21024044783.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0973182bac---17908844123.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160891ce3b0dcc---lefem.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/45333219737.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8fa9588ff7---48938052048.pdfIn PDF document text
    • http://momsystem.ru/public/file/18344124128.pdfIn PDF document text
    • http://style4.allwebeasy.com/userfiles/files/24465715.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608554a678000---38681905057.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=carbonates+and+evaporites+pdfPDF link annotation
    • https://www.posluh.hr/ckfinder/userfiles/files/bubozut.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_off0000da13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA13 17404 bytes
SHA-256: 922131c45999fea778cf1149090efbab427365b683f8b66a9b49b4c48779bcd4
font_01_sfnt_off0001078f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078F 10684 bytes
SHA-256: 14914d3ac6e5ece5251953b915339271ac3bd2d0fcbe317c0a39596fdc4c0ab5
font_02_sfnt_off0001200b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1200B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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