Malicious PDF — malware analysis report

Static analysis result for SHA-256 95545c5760a6ba65…

MALICIOUS

PDF

90.2 KB Created: 2021-06-28 21:44:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 040c5523cac8cab3c0aa1df1d6e1a9b8 SHA-1: 6d4241f944c4b32979fc887c80af16f3c750e419 SHA-256: 95545c5760a6ba650242a945112d4f22b247163830525ae2840738f1b392d1d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, forming a link farm. While no scripts were explicitly extracted, the PDF structure and link farm indicate an attempt to lure users to external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://memoservicesrl.it/file/jofipazafiradewirarumipeg.pdf In PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a636d51f0a6---sozovevo.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/31597566196.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072958b70b03---lirozovatabozidudefaxav.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/9e1510f0c9ac25e5c73b657a777b4c09/dofedobijivimu.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/52398562975.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/tnq1oqf5qng56lbspek8kj2mv3/winuzamugixizoxanulimevew.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/mosowogefugoberugejani.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ed76b2cea---susoxafik.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/utgojsdud1grkq93n8vuho23l6/24542416165.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/ef259307db26ce7c6caa9c3def477a80/rakotugaluvek.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9722b84db---vikado.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9bfe3a6de3---31347194780.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/99bed04231b765b1fa96304c4cf7afd9/mudijemu.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/bmg67j2k0lf5a5ht9teub697i6/nuluzawometevelami.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/sibakakezukefusinijugeli.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/df035743f8f8a4afbfc556f9d4a7a71b/jarugofajik.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2339d79ce3ab18ad75b340490f4573f9/welegilejedevosof.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/otuteradodarenipawej.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/21811206166.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///12202291882.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/klumj3m5agudc60mq3opc09vf6/napasirebosazujedago.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160764d5d019e1---zavuxabasesakavuf.pdfIn PDF document text
    • http://rosycaffe.com/file/mepomixiwevobofegagudej.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/67247901645.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=what+does+it+mean+if+you+have+a+black+stoolPDF 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_off0000fe3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001164d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1164D 16644 bytes
SHA-256: 0fe9d90460fd0aa16283fcd9562a9dc68dbd03b9ff4337c9bbd2ba31e59870b5
font_02_sfnt_off00014161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14161 11144 bytes
SHA-256: f194598395eb0c6ea59741f3053952a5ee1a2e81aac3a0c3e65c02212143bfa0