Malicious PDF — malware analysis report

Static analysis result for SHA-256 9568cb8bbe542852…

MALICIOUS

PDF

124.0 KB Created: 2021-07-06 05:46:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4014c21a6b3119d32e2f440d004c5c00 SHA-1: 0b90ae1bc496b3deb0e6936496b7702719ae586b SHA-256: 9568cb8bbe542852802e8e33fbffde86cbb0f3de31b4eeb2004da6fbd5e293ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple websites, many of which appear to be compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware distribution sites. The presence of numerous links on disposable or compromised hosting further supports a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9371bbb0a---sapipev.pdf In PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b26dc483955---muzokolixevovivipogaradu.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/34116294152.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cba8d0033b---59142800914.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/6ajk17ut39tjltmtuuvafqkl6c/60168379701.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160982e501f828---23709744431.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607d23369065a---97966334246.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16073b9f80594e---61080463959.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/zofutoforejoralunofamo.pdfIn PDF document text
    • http://nnrhc.com/clients/9/98/980d61ede38c9a35fe3396fb65651545/File/fusovotabemarozafuveze.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/30793241299.pdfIn PDF document text
    • http://dtcguild.org/clients/80367/File/84143268261.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/jekiwuwomefopizekuxepomo.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/luwaromuboxunanu.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/c3c2272f27aeef77762ad0ddf3780450/terekagexepilajolas.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/77299867779.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/21f43d9c45eed458a97dab0ae738942c/82143456869.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbdc3b97dcd---50302698653.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/4ou2dbnm2tqffe7hjj15nvfqni/10025073574.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/4e40vvcdg3d237f0ge8dsh0cvr/lalezilob.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/15267335468.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075bea937d16---4308384524.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/8410c2006b3c4c507d7fe65fb99bcfa7/3660029761.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=realm+of+the+mad+god+websitePDF 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_off000180ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x180BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000198d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x198D1 10868 bytes
SHA-256: a1326cffeec8059273061d15d339486631c31ba6d4339dafac6a12f532d9bdf6
font_02_sfnt_off0001b1be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B1BE 18224 bytes
SHA-256: 4944be989090c3b52ee13f713cab578126d990b00b0a026c10bcc11ad9e48a07

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