Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcb13582614accc8…

MALICIOUS

PDF

97.3 KB Created: 2021-08-13 21:52:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a46165f4afe90ac00332c6fa4224429b SHA-1: c8592cae37acb0cdb2d9fe5ccd4b7b63345590a5 SHA-256: bcb13582614accc86a8f5ee2d28d1d3841b689ff4d3261bc56ab0eb54e32c546
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 WordPress sites acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to redirect the user to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/161129d38b64cb---66271329731.pdf
    • http://zkojicin.cz/userfiles/file/rumatamokiwadirinija.pdf
    • http://moreit.ch/productinfo/file/12058992775.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/36b39f581ad7c6e59ac45677940f2650/42064365326.pdf
    • http://cy2hand.com/userfiles/fowesidimasefaluko.pdf
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/5863145518.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/5vg8lo7n9pp36a21rmegnfttik/7596577557.pdf
    • https://rajatotogroup1.com/contents//files/23014332242.pdf
    • http://olimpic.hu/ckfinder/userfiles/files/mowelek.pdf
    • http://highendschmiede.de/highendfiles/file/99740921416.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a07ee229518---fuvugakelumov.pdf
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/vidakowularagak.pdf
    • https://ktmcollege.org/public_html/userfiles/file/99105918437.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/qeft2p9anahh27dtmll414o1d5/27805133461.pdf
    • http://sincaremedicaltour.com/js/upload/38775863807.pdf
    • http://sun-tes.ru/files/file/32497711406.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16115c15e7ae7e---xideduwuzuxijusubekokiw.pdf
    • http://heninrealty.com/userfiles/files/59106365315.pdf
    • http://nollve.com/img/editor/image/file/76086727919.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b3e0a1d10---boxobusa.pdf
    • http://c2ctrading.org/cms_upload/files/41459251678.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/94b84d68637a8b73f7bbbb4284d5cd1e/wagerun.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=beethoven+moonlight+sonata+piano+free+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de7b.bin
799aabc2ffc061e0d47e43e9dd8780ec9b8e6397abe9fff7c7bcc120225e90f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7B 23320 bytes
font_01_sfnt_off00011a73.bin
78534a70d07e06d393969da2ac2794865a2e90239d94db3a1da51549e3cefb6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A73 1920 bytes
font_02_sfnt_off00012352.bin
1a3a84ee0b5862f993baa4393103ff98cee7e8c9922b48763186b20ba937176a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12352 17084 bytes
font_03_sfnt_off00013cb8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13CB8 16792 bytes
font_04_sfnt_off000154cf.bin
80bca62d6281d3cf4860a5fd091eefc43a13cd11ca2487b6158e253d6f226efd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x154CF 11152 bytes
font_05_sfnt_off00016e53.bin
5c03073ee5b942558499f30f9dae031338922db4c338689b9b374e6b39b20ca3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16E53 1188 bytes

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