Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f8ef00813398adf…

MALICIOUS

PDF

76.9 KB Created: 2021-07-17 22:07:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 992e7eb30435b8b9061552b78bbf8a4f SHA-1: aafd60936b5a41330a1a73ab43c092f4891ac2b8 SHA-256: 8f8ef00813398adf3a218f58e93573ebab8ea7481f6b4faa8fd5293ec6b6fce3
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of numerous links to potentially compromised CMS upload storage and disposable hosting suggests a phishing or malware distribution attempt. The document body, though heavily obfuscated, combined with the heuristics, indicates a lure for invoice or payment-related scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160728c5cba3dd---putofutewogabem.pdf In PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/f6l4t0hbba4tn1ip0oq7t8b51r/lakirejaj.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccac6df44a---xisofudupopazakizovus.pdfIn PDF document text
    • https://angkaganjil.com/contents//files/60315197375.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4a86bf472---14228854778.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/madevetivenolog.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/tuzodatavasujopekusibiwo.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7e4d76653---55047680381.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/zagamawusopim.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c95b5224b9---bovagojavigizuxorobapin.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/6968e016f7fed1dbafb2f8e6d2d3e892/rejaxibimejemusuputowedos.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160a152cf5b75c---murezusonuvuzud.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/xateb.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749735af66a---fodurenepelego.pdfIn PDF document text
    • http://cga82.com/admin/File/jufawatugupovoroxof.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/bivugolezirepubutilewe.pdfIn PDF document text
    • http://china-zzld.com/uploadfile/file///2021070703283726.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160afed68d6753---kizapilujogubekewit.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/62923028348.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/680d81c01b4ffecf4e405a363432b8a6/34933157973.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/fozodobasiledexanelobevu.pdfIn PDF document text
    • https://www.dars.bg/ckfinder/userfiles/files/53258746055.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+export+word+document+to+pdf+on+macPDF 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_off0000ca9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AC 16444 bytes
SHA-256: 0ece42a8d927b308a86081ed932295a33166eeca49141e1c1f74585229ba4e5e
font_02_sfnt_off00010d63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D63 10752 bytes
SHA-256: b31b60fdcdeb9fb232968fe1f289379f694348e2a6f16c4696c1564f43b50414

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