Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa38113da49ba4cd…

MALICIOUS

PDF

141.3 KB Created: 2021-07-07 08:28:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 93eb71edfa6f8abfb6b7f711f7000011 SHA-1: 1db7d8c88e99ef7a4c2eb7fde56c1b1c04687814 SHA-256: aa38113da49ba4cd3f7923bea78a280f349450ab945543a5a4b9db68c09c2e2a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/rmq39pd30v1dk6v5jrqoh21os3/95968255007.pdf In PDF document text
    • http://yaqeen-eg.com/userfiles/file/89472319645.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc2d2927638---94698918738.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/355bbf21108bd1ddb3688b2c3d35db8b/tagexomarogurel.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/d503ddf690582e2ff6adc0ee55c4f2f4/65662576994.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d66ef03c50f---8859860881.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/dokazuguzisawakamug.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755daed9058---pevisaxa.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/xuxirozazodepokozodoloras.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/wizarixo.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16090caa60a347---80735472409.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/3d70328b72a4ec23e816dc927f9e2fdb/janekopewet.pdfIn PDF document text
    • http://ruresept.ru/files/file/55034006308.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/barexilesuwajovu.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/tq1tlp2t5qqbsp4f7omhma3juj/34772749744.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/d57ac7bee519924ca23c2d68a02f20fe/78080233698.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/1f5bf6765223f32af5b1eeddec7f59dd/goregexofafoxidagenuzomi.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/77020628080.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/82282376363.pdfIn PDF document text
    • https://ebooksweb.net/files/file/61955355679.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffbf6f1e3d---92385912960.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/35092633967.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/ee4tmdejh3g1rp4hf5e6aqj8c0/rekasiwijeva.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f146a5504---jepigitifazutojuzonaxidex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=consciousness+is+immaterialPDF 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_off0001c81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C81E 18544 bytes
SHA-256: 5f48e3a1d2bf4bb751b830eab37c92c08efdb45c0dabd1f8e0c369e404172950
font_01_sfnt_off0001f777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F777 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00020f8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20F8E 10520 bytes
SHA-256: f203da00a83f727ef2949b8c9bc9bb10c6ae49e84473afe531534302ddaaeaa1

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