Malicious PDF — malware analysis report

Static analysis result for SHA-256 3380f8e2937d6cb3…

MALICIOUS

PDF

86.5 KB Created: 2021-09-08 19:33:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 44296f5b47753914ae959958b7651619 SHA-1: 64c66ee99784f71e4f45acbfd767926a3e1b7783 SHA-256: 3380f8e2937d6cb3ced50180af413d577cc4d2c4b47c3bd12f77314111e20dc7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports a lure-based attack. While no scripts were explicitly extracted, the PDF structure and numerous external links indicate a high likelihood of malicious intent, possibly involving the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://smidgel.ru/uplcv?utm_term=ts+icet+2019+syllabus+pdf+download PDF link annotation
    • http://gniortho.com/files/Upload/file/figesikodiven.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/wejewufagetufidopowe.pdfIn PDF document text
    • https://sunriseinnjasper.com/nbloom/fckuploads/file/67753175459.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/93900351698.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/laruxekujepewepixewap.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613155db26018---50822049702.pdfIn PDF document text
    • https://www.aledrukujemy.pl/ckfinder/userfiles/files/33668761140.pdfIn PDF document text
    • https://bczenekar.hu/files/file/niwamutazuzejejifax.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/69387845208.pdfIn PDF document text
    • https://cv-vezouze.fr/media/file/zelozejumiso.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/10396695546.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/390065599.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/lewixatiwamesezol.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/lusetabofuxesibiji.pdfIn PDF document text
    • http://mzch.pl/userfiles/file/menoxuvazaminenekewak.pdfIn PDF document text
    • http://unityproductions.com/upload/files/nejojomolowi.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef41991546---sezel.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/98520000214.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/992b713c1491f4c424b56ef7521e8a57/busimiwaxubawemedek.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/83996871136.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/juwedazetamasikupopak.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/51877656287.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/13582588625.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_off0000eac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC7 11376 bytes
SHA-256: 0d2720a6445f73a13b5ee19b112135b704dab9131e350bb08fbc057f09e6137e
font_01_sfnt_off000105b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B5 17904 bytes
SHA-256: 821c93b47ca9505a6d6c263b58bfb461e75deaf8f64f8bd56c7bea9521a10bbf
font_02_sfnt_off00013404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13404 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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