Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8d704ad29d86127…

MALICIOUS

PDF

81.2 KB Created: 2021-09-16 10:45:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 21672c8e6b114382fdcb4c8616a95085 SHA-1: 31f91d638d1f9a61f8b8cb01c66e4d7b535e7e1c SHA-256: a8d704ad29d86127efe3803d754474ba34c2a94bdd13e692570f91d087adb822
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised CMS platforms. This suggests an attempt to lure users to malicious sites, likely for phishing or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://huntic.ru/uplcv?utm_term=mass+effect+andromeda+characters+voice+actors PDF link annotation
    • http://serviphony.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/51019794864.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/21321607821.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/zeniwatedi.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/161419069315b4---99982251257.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/tigetiponugogibajan.pdfIn PDF document text
    • https://aarushimukhwas.idealviews.com/userfiles/files/mipajolozumujesamugit.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/didarakibududikoxozusotuv.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/files/77550641554.pdfIn PDF document text
    • http://mydreamtuscanwedding.com/editor_up/figudukefufawudol.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/rg4jd3md4jlcmrjkf275a43sdv/fevaru.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202196747359942.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/kolofobukosina.pdfIn PDF document text
    • https://salwangurugram.com/files/35579266072.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/83863540955.pdfIn PDF document text
    • http://denkobarbell.com/_upload/files/lodarilor.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/77962066840.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/17825765007.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210909170645.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/godorekuno.pdfIn PDF document text
    • http://herve-coiffure.ci/files/texevopotel.pdfIn PDF document text
    • http://ymmicro.com/files/files/nukadu.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/3128f4c0372a48e7b28e93c7d297c898/87172205391.pdfIn PDF document text
    • http://nppgursaraijhansi.in/ckfinder/userfiles/files/20971349611.pdfIn PDF document text
    • 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_off0000d9a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A1 10752 bytes
SHA-256: 88b7745e0733935ab001195a4e7fdfcc5f5eb4c3524b14cbd337b5789217d283
font_01_sfnt_off0000f233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF233 17180 bytes
SHA-256: 524d4e54cd9c504a4ed43e34cbaabcd26a379d213cd24a21d559bc2c4edec402
font_02_sfnt_off00011ea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1