Malicious PDF — malware analysis report

Static analysis result for SHA-256 02f503a6db63bb09…

MALICIOUS

PDF

85.5 KB Created: 2021-07-13 18:58:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0db71c12cc4648f904ddc414b1be9f62 SHA-1: b16affe60cd5160637829529834fee1c2f330166 SHA-256: 02f503a6db63bb09e792d9cbb95243fd8255dec154f3530ff7c8be2e7dcb1538
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://ankaser.com/userfiles/file/49246605325.pdf In PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/81672072346.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/4fece6388fbe6eded2338ddfcdb5c638/vasogedegifuxuta.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f6a17bd32---wogulisawomarezerake.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/jafalebozajares.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/vakemumilomisisineba.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/guzebadudumanuwevudofuge.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/ripkput5fi1knh67tn1mlbovhq/46271127752.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/sozoxubosaronoralatuduwa.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/47039834400.pdfIn PDF document text
    • https://sportcity.bg/webroot/img/content/files/3554827769.pdfIn PDF document text
    • http://absigorta.com/E/file/31504997462.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/kamozogoro.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/35803990348.pdfIn PDF document text
    • https://melz-feu.ru/upload/bujiwudu.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/zasozujenoduda.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/8444371921.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/15c097e59cf59d4b16292569e501a25c/67152583118.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/tufofewul.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087c385644b2---35114216783.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f568a76f0---65406571401.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160901a86e79d8---32259056135.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/78151090843.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=learned+optimism+ebook+free+downloadPDF 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_off0000ea96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A8 17216 bytes
SHA-256: 04dcde8ee3028071257efbffb4330ac3465e80f637465c01e12233c4126129e9
font_02_sfnt_off00012f96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F96 10932 bytes
SHA-256: 13be6b9bcdf455e973d51e524ce5f0d3eed1aa3233786c00a84fe3be56866cc7

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