Malicious PDF — malware analysis report

Static analysis result for SHA-256 41001ae8f674acf8…

MALICIOUS

PDF

70.8 KB Created: 2021-09-04 07:44:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fab6dd169c5784578747bb5811b857a6 SHA-1: e584a664c65928b6be81a190aba861abd76e8044 SHA-256: 41001ae8f674acf8337cbc56b7843677fcd98b6f52ecc2868eb769ed617afd7a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress installations or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely responsible for initiating the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd8906cb48---60655737213.pdf In PDF document text
    • http://thefarmatarapahoecounty.com/userimages/3442795075.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/fuvuvaruvom.pdfIn PDF document text
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/58925095406.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/21315110343.pdfIn PDF document text
    • http://hrjok.com/uploadfile/file/zazozav.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/gurovopawuvivetapefasipeb.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/seminixupevepuza.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c4eebe89277---biwetikowatafasuxamata.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/e232976a80b7cbb4d535dba8e2348d9d/vefaz.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/46621738583.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/soburita.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/34165712913.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/60475514345.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/ruxegibavifaruvavep.pdfIn PDF document text
    • https://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/b87f824992ba4b31a54b767668d999e3/54729077369.pdfIn PDF document text
    • https://alcoolassistance-creuse.net/www/site/js/ckfinder/userfiles/files/42174956614.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c507d16696---88897991665.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/07/05/68059763626.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/433f0420849b5db875a22e97f93f58db/gibawujukusefogabe.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16090949d26045---sibopep.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080878f14299---51962164341.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/fatesolawoniv.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210530084629_399625592.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=concatenate+function+in+excel+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_off0000b8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8B1 10580 bytes
SHA-256: 601556c7331a426c54527a576c763ed248b3c4cea9f175689b65df18f3cf6b7e
font_01_sfnt_off0000d0fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0FA 14632 bytes
SHA-256: e98ca112e284d5945e79f830b7f33591f80bb49dd943c7961283107fd9264a92
font_02_sfnt_off0000f530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF530 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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