Malicious PDF — malware analysis report

Static analysis result for SHA-256 c19eec17df7b318b…

MALICIOUS

PDF

84.9 KB Created: 2021-09-01 16:20:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cc9e913fce740887b235d76a58fe08b5 SHA-1: e618ac2ffedd9692b4fa50444c9af0e439ce03c7 SHA-256: c19eec17df7b318b16bb0eccf04821f25784ef683a83c71517eb847886134c68
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The primary attack pattern involves directing users to these compromised sites, likely to facilitate further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/81801122d0798039b87efbaa2cf9d195/mosalotu.pdf In PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/17738306631.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/d0115c5861a61023a7655a31f7593516/xubasozukezazurup.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/64969222960.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/c4b7a00829c10f6f7e6c4e0c9913c15f/3383189066.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/jruiu75qvk3ses6oh7456bifa5/74281161030.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/79590299440.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/zixokawugar.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161122a3201e08---85280998098.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/wukomesuli.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/mv04gr6dgmdshs46bqsv1da92o/1224678729.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cc0ad2d3b3e---vududejimigoxisit.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/95518233976.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/suvalufexamufigavog.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/tivifoto.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/72re0139fba61h2ktb0s7dba25/lobibawibuve.pdfIn PDF document text
    • http://toyotaprius-custom.com/js/upload/files/zineguxinuwupomupo.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd359da68ed---93283852116.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2c2aea719---disifebapoxe.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/35357606742.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/fomipenoluda.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609e570a58be2---nitigosizasosadukifevine.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/wirakimomunexe.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/34362750225.pdfIn PDF document text
    • http://goodwynva.com/clients/d/de/de91e19d235d8a3764238851c6b73f99/File/82482613108.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=what+is+positive+ethicsPDF 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_off0000e644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE644 18516 bytes
SHA-256: 53dac95aa01c17d12837d9c3f81b04676abc4cb9088a84490fff9a4e2fbd89f6
font_01_sfnt_off00011613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11613 10280 bytes
SHA-256: b2af22725317d6a094077a09beb648d17177c0befcc3c9a6d87eb72efd6718db
font_02_sfnt_off00012d74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.