Malicious PDF — malware analysis report

Static analysis result for SHA-256 96816bb691194e2e…

MALICIOUS

PDF

78.7 KB Created: 2021-09-30 23:15:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 556bd0f7b3bdbf9ed893bff62d50d0af SHA-1: 44bd1b85591262a0f7c2a287699ea42b39d3f25e SHA-256: 96816bb691194e2e68bf4b56bdef4aa2778fa28f85649b23f4614092584c0378
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to external sites, some of which are hosted on compromised WordPress installations or disposable domains. The presence of external URIs and link farm heuristics suggests the document is designed to redirect users to potentially harmful content, such as phishing pages or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://synerhu.ru/uplcv?utm_term=call+recording+cutter PDF link annotation
    • https://motodubai.com/uploaded_images/files/pifajukabujazolezozelola.pdfIn PDF document text
    • https://businesslife.com/content/files/jakazevasos.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/98520786859.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/82108722184.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/xepemosikoxozadol.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1614b5200c315e---51358254366.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/uqd7u8i6fq4ei59nmgib87hanh/90819434142.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/28919203699.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/53029903661.pdfIn PDF document text
    • https://ihappywash.com/uploads/files/202109232034248481.pdfIn PDF document text
    • http://allergya.news-read.com/upload/files/dofadabekisomijide.pdfIn PDF document text
    • http://vit-physio.de/file/85960366633.pdfIn PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/48368810131.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/16919637794.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/aca20fc3a57c5bcdcee489116f428c40/39418402209.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/72648624894.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/75731380479.pdfIn PDF document text
    • https://marblobath.marblobaths.ph/app/webroot/img/files/99268325749.pdfIn PDF document text
    • https://basealimentare.it/webroot/files/fck_uploads/File/tirimivitij.pdfIn PDF document text
    • https://mimpidia.com/contents/files/zevawowow.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/dunomefexowexanenojegivo.pdfIn PDF document text
    • https://noddy.nu/images/file/woloxifogarosinaninu.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/14324257445.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614122cec4d53---nakijedekelusulidewanoja.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/37422960691.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_off0000c9c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DC 10508 bytes
SHA-256: 5387a514cb03fc555136e9559ead7b1cc21d4f1664f473580c9653b1bafb2670
font_02_sfnt_off0000f9a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A1 19652 bytes
SHA-256: b737c01edd5cc02c6d45d7a415540d1b51727184cdc3e0d550c3de44e5c6000b

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