Malicious PDF — malware analysis report

Static analysis result for SHA-256 28a8ac4e0512a41a…

MALICIOUS

PDF

86.9 KB Created: 2021-07-04 20:08:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: fad7f72dff9cce2ebc9382ca8bf09e34 SHA-1: d604fa6608d497492ddc3d14e4796ace53fd289e SHA-256: 28a8ac4e0512a41ae4d98fa47656bb6e1e3ca941298ebf3fd1d98aa41dd01d4b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://krisoc.ru/uplcv?utm_term=warzone+how+to+play+outbreak PDF link annotation
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6722f2b7dc---38508172003.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/bikapujipuwifijalopof.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/91c683be8787f7d1525f88fec028a530/2172622545.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/ac8d60e713877e5f82eeca662dfec429/jisidofijozuzogixuzakotoj.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/s2jf0olnnd8umm8b67hjh2ncih/58072209679.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/s2u5j89apu3m9ik8lm2dmf3t5l/kakaliket.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/41937831758.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608050378b0af---xogigigumadamakidirud.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160738fb2cf7dd---sijakodarezekiwe.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/49e47623b0beed373decc5d6fcfa6251/fusorixixifekes.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/vepibikigekugewat.pdfIn PDF document text
    • http://aahsclassof1978.com/clients/b/b6/b6117739535924054831d33ecd54b00a/File/90858596609.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4760b94ed---mujolujajutugi.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/fadesixaviwomixo.pdfIn PDF document text
    • https://artbynela.com/uploads/file/90568999679.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/d4a1fa794fd4f2b34da40b47b9ff125a/99439310809.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/9ffe1e1fdf1ea4b73e65421ecabe453d/17518895958.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8af708353c---vineguxezoliwanejobanut.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/08ac0a9eaa53c0254d9f8d2762884fe4/mukiwama.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/k34p32d2i87o5hfs62iub8gb2a/famolifabowamasebobakidop.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/suvusutalijojotaga.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/jokumagadumajizaseger.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/ginifi.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/739fc81485a2b2ed7f6b5f4a72051a71/miluvobesejej.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_off0000ee03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE03 10676 bytes
SHA-256: 69333ad2816ec04446d5560161acf242dda362dcb3146fff71f5e29bcc72a57c
font_01_sfnt_off0001064a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064A 18176 bytes
SHA-256: ffb75d583f17b9f5cf12c7eb86ea323eaef38af7671293fb84b91a7c2351efe0
font_02_sfnt_off00013483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13483 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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