Malicious PDF — malware analysis report

Static analysis result for SHA-256 819ea5ff19df5f67…

MALICIOUS

PDF

84.4 KB Created: 2021-09-06 14:22:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 824b54c4012212dddc85b20cfe82d5ed SHA-1: 3a765bbe20d7d69013c80237f05762735cd77f41 SHA-256: 819ea5ff19df5f671c7992077ffc57c208a1aa9fb70fc1da30e09268f88c6ad2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://sun-eko.eu/files/file/13327577041.pdf In PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5fectmfrb3422ajg85c6mpo6q4/5625460352.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/056e0070e5db288aefd493cb74cb0876/zibejoxuzegu.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/202505d4821bd3335b92425530b60446/xixirefogofuxipituz.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/4999510035.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1607e23baa0114---wufidibomazil.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d7319aaaa---76403994449.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/bubilomijibavu.pdfIn PDF document text
    • http://zzps.pl/userfiles/file/62202411795.pdfIn PDF document text
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/rowom.pdfIn PDF document text
    • http://szwygs.com/upload/takagajorudazafalite.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/23808700633.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/74315590719.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/wewurajejesapir.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612aa08b64a02---85144514967.pdfIn PDF document text
    • http://mebell-city.ru/ckfinder/userfiles/files/wuterorefuwifunexila.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcff74ae724---tunafenenaxasebo.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/17768101747.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/a51eb2c5cc0fb1c6cb18bdc4b1508bf7/68201670097.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0cdd966b5---belajexitol.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/5e8087d3b301b2a9ebc80b59812f1433/12107505932.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe278fe08c6---giratikugexidabo.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/41000500081.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/gokiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=antibiotics+generic+and+brand+names+pdfPDF 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_off0000e26a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7C 18832 bytes
SHA-256: 13a79e21cea2e4043fc37fad689cfbd7c26f8688ca09d65732f41e4a806dda11
font_02_sfnt_off00012af9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF9 11040 bytes
SHA-256: 23842b32c83460b6df92b5d88ac731559d2d2aa2ba4e591a9e22703f7223403b

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