Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbf6b075cdb3a4b4…

MALICIOUS

PDF

78.7 KB Created: 2021-09-04 03:36:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 360dd46ce7cb388549ce3bd672852590 SHA-1: d45a550de7e9e221b5b4b7465b0f9876a51e9fd1 SHA-256: fbf6b075cdb3a4b468b633e87ca856c8ea5f5172a5b5258052810730d683a424
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains an embedded JavaScript stream and a link farm pointing to compromised WordPress sites, suggesting it's part of a phishing campaign to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware or engaging in fraudulent activities. The embedded JavaScript is likely responsible for redirecting users to these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b32f3c446b4---tiratonovamurujinegi.pdf In PDF document text
    • http://moreit.ch/productinfo/file/vuzojumabik.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/41514328801.pdfIn PDF document text
    • http://susutour.com/userfile/file/69524632194.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/jukibum.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a9dff5c2315---fowirol.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/17da955c8182e68acd0ccce9b876ee74/mironavawikidebuwiwil.pdfIn PDF document text
    • https://mimpishio1bet.com/contents//files/91324888106.pdfIn PDF document text
    • http://apple888.vn/luutru/files/kikapudur.pdfIn PDF document text
    • http://strandedtattoo.net/file/84435783255.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d292e38172---6741044532.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/37142048251.pdfIn PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/tenopivixaralas.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/57635873097.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/xigexekatosalus.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/d3b9b37e87ec0c36696c2d4e79480983/detezadiwudegutoneko.pdfIn PDF document text
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/1442768837.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/35a6982453abfe29602053085aed1f72/senolorakilanubinizugi.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/d801ecd7ab93f1d2e56e549c0803ad66/49994690768.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/47900428964.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-6-28/20210628220616662853.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=unir+varios+pdf+softwarePDF 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_off0000cf11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF11 10604 bytes
SHA-256: 2a11ab98c326fe4a45c52d0e2e625ec8d31415a2b015fc7467fe760149c80ac9
font_01_sfnt_off0000e782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE782 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF94 17628 bytes
SHA-256: 8427dbdf366a1fcf46a735f975cf23ac09becfd61c8a6b254f0a0d97f2ea6de3

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