Malicious PDF — malware analysis report

Static analysis result for SHA-256 99ae6a8de9d3b9de…

MALICIOUS

PDF

85.8 KB Created: 2021-06-30 23:15:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6cdcc66c120faa2645b9a77e7f660ded SHA-1: 5f5e490ab4354e59ba5926f286a87d4a513759a5 SHA-256: 99ae6a8de9d3b9decb03e5ea7f9d73c45d702113bb725a6190be408a8aac0a24
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent. No scripts were extracted, but the structure and URL patterns are consistent with phishing lures.

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://catamma.ru/uplcv?utm_term=smart+tv+spying+on+you PDF link annotation
    • http://puzynowska-kancelaria.com/userfiles/file/85419693708.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608225276a176---90410981460.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/cdafe91b5f9efd082114ef1b254b37fd/foleloromedosaz.pdfIn PDF document text
    • http://446888.top/userfiles/file/tupizuziminip.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/noxinexoteramixekudagido.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b16b8e15dc---nidesosololuxasak.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/e9e16cb05a2bae2974d11c34a2a3286d/17439880145.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160c94727d1286---jexakalaxalugezorunu.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/dikevominal.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a8162025368---nejidekipurulu.pdfIn PDF document text
    • https://quaint-house.com/18794569109.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/hvc6a3rsriaqka8hu9u871bvd6/mewitukamoxofosijidotud.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xutumipuwepopivenitokubul.pdfIn PDF document text
    • http://cpils.com/userfiles/file/1537612792.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/ejbumiclhdemm1qqgk1nhb7jv5/xojepax.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c47bbb4ff---28749650064.pdfIn PDF document text
    • https://cafe-malaysia.com/contents/file/48364159686.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cdcd3bc5fdb7453069c378df72cdd19a/31055551006.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/b3e4ea7336275bc30744c4438a45c6d5/vufebarubidog.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/35qmma74hpotutadthvsn1esu1/63685022073.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/j5fn2t571r4j8ar8b8ogd7861d/pamovajapolafadasex.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/80fvos82jr5iahktbb0hclec53/dosexibiwisejude.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/87073170317.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/544a0ca4c6b9159723e1e785f4d55cde/27649741225.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_off0000eb29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB29 17120 bytes
SHA-256: 45c2fc7b0c5f454629b2cb8aebd6a5f58f039a3cca4977ee02cf7effddd0b8be
font_01_sfnt_off000117dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117DC 10772 bytes
SHA-256: 4c2268eafe4a1ed20b057b88f95035eb6efe968f94dc0c06038f9f9b4a2ec7f7
font_02_sfnt_off000130ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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