Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1c6e10186bff09e…

MALICIOUS

PDF

83.6 KB Created: 2021-07-21 09:33:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 064789e4cf98c1e26c860be9fe294e6b SHA-1: 9d01204e8d7e6ca62123561a546c0cd60a989730 SHA-256: b1c6e10186bff09eed2b074350c38c5e792d01ed06db622f8939e9e0dde797b4
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to disposable hosting or compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of ClamAV detection and ML classification strongly indicates malicious intent, likely related to phishing or malware delivery. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may be part of a multi-stage attack involving encrypted archives.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://anyimaker.com/upload/users/files/baduwoxevo.pdf In PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ee7a865dac6---43899732333.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/56811474849.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/4828179500.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/32ng5olp17omf3fj8lfvdcvsd6/wugalesexetan.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/f82a0430eb4c1a11d4181454dcbfe583/29088775192.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/ee876b3c46fb2a75ade3fc58a00635a0/79820542400.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/11100902168.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/wananoxeg.pdfIn PDF document text
    • http://peak-experience-japan.com/44695568832.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/fufuxoxodok.pdfIn PDF document text
    • https://jamurgoreng.net/contents//files/sesotasosujiva.pdfIn PDF document text
    • https://anfauglir.com/images/file/zusosexudiluwuf.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/14502873772.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/47b9de17d0f2d4c79a0ae082ef99e895/roripe.pdfIn PDF document text
    • http://fpsh1980.com/clients/7/7d/7de5299bd6bdc19cdd6b275c058e9c4a/File/16049210296.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/c1393b02c93ffbb2c048bbce34839065/48289104432.pdfIn PDF document text
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/wakibejexenoripoguk.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729472cb50f---funezukel.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/3487ad464fbbe373db7d65a7a34d0e19/zifinuwilugigivolixenab.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/23412584144.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/56365049262.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/kirinigo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=does+chrome+have+a+compatibility+modePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD938 10996 bytes
SHA-256: 37db53b2244c4fbbbb9c782e62086e29fcfd842377b0fe51e8dec8f771c26f40
font_01_sfnt_off0000f29c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010aa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA9 1728 bytes
SHA-256: 164b17f13be751c428b8a7847bfef4401e4c17c2bf41cfc2fceec83f5d69c6ba
font_03_sfnt_off000112de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DE 16976 bytes
SHA-256: e3832d65310da24a039802676ec4699696b5891d7b177a4d80ef756c86acf361

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