Malicious PDF — malware analysis report

Static analysis result for SHA-256 17fed8147c12886d…

MALICIOUS

PDF

84.6 KB Created: 2021-09-02 14:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 11e1c5220aaf7bbbece19701f4e0db84 SHA-1: 4a060df1f53fbc517a150743c41f8c0e19155fbf SHA-256: 17fed8147c12886d15bfeaa8774ce7eab57ca19635393e6e3ab73aedc5fbc9aa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports a social engineering attack aimed at tricking users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://kleiberit.ru/files/file/53342059353.pdf In PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9f1f2897a---gatanapafiwolazomazi.pdfIn PDF document text
    • http://yuha.be/_files/file/58739727348.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612505bb25e3c.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/s1ftoctl39edcv3t5r54frp4u2/39784215792.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/vidosezudegewamozo.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/29563912395.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/49124341876.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/doq3ls10hvl0aarklh4uloc7ha/18432924141.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/vosamupit.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/74aabf23a4f1a60814beddd470d942fe/fenizawuzurafisapiw.pdfIn PDF document text
    • http://tiquital.com/documentos/file/vidususumelefube.pdfIn PDF document text
    • https://saam.vn/images/content/file/nevopofuno.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/goxosazodiwalodijudexedu.pdfIn PDF document text
    • https://windsbs.biz/files/file/zujuvizolewolup.pdfIn PDF document text
    • http://violetstudio.in/userfiles/file/3383067289.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/1q3ceocm4kkqlen542odd7ra4j/30262707812.pdfIn PDF document text
    • https://langestrand.se/anvandarbilder/204/files/24115867885.pdfIn PDF document text
    • http://normel.org/files/upload/file/54106957988.pdfIn PDF document text
    • http://93564497.com/userfiles/61856456740.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/genuxovazaneladi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=organic+chemistry+all+reactions+for+iit+jee+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_off0000e384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE384 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9B 11336 bytes
SHA-256: 950a18fdc6db85eeee5e749a309478f3529a966a53a8dc6d264b84c093dc1983
font_02_sfnt_off000115ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115EC 18008 bytes
SHA-256: 0dcceef0a6a94c1c8332ffe279788235213c435bbb9235dfaacf996853fe8bb8

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