Malicious PDF — malware analysis report

Static analysis result for SHA-256 85b643140f9671d7…

MALICIOUS

PDF

79.7 KB Created: 2021-09-02 04:54:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7e0533621b9578fd769feca772635acd SHA-1: 68377ea04bf4d4a5672b7049622dae87a41c3b9b SHA-256: 85b643140f9671d7e416ae72e3731398a46aa78ab0bf61f588ba49b028292fe2
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous other PDF files hosted on various domains, many of which appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external links suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c8878c9cc73---pubese.pdf In PDF document text
    • https://h1t-url12shio-turbo.com/contents//files/penaxirawix.pdfIn PDF document text
    • http://xn--elementy-zczne-kwb98g.pl/media/file/63255630380.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/14179713577.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c42e9bcdd25---26091695500.pdfIn PDF document text
    • http://shs67classreunion.com/clients/b/bf/bf9552935413f2527bbee995f2dfc9b5/File/3153320085.pdfIn PDF document text
    • http://chouchouphuquoc.net/upload/ck/files/vawiteson.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/89561996955.pdfIn PDF document text
    • http://focostrade.com/files/20210629004935.pdfIn PDF document text
    • http://lohs69.com/clients/82366/File/jezukavodifufuralow.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/td441p36q01h3sb3d46fvoc5jr/32325399638.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926a1befaf3---pejevisonalajixezefixo.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/dugejozeniramemosiposikil.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b6904335c---82591556472.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2e7434483---xakuwiruvogu.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/16144800371.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160882991039cf---levememidusoxemobefigesub.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/55232032001.pdfIn PDF document text
    • https://arket.io/wp-content/plugins/super-forms/uploads/php/files/7ip2debcrjgsvud1nitc7io7v6/welilivorudoz.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/24671290706.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/zojazogukubegilonapesojej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=union+8n+cycle+computer+manualPDF 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_off0000d2f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F0 10796 bytes
SHA-256: a46fc4478f74d878d550490b90a7a4732f1113366f647101ece2856c2cd37a78
font_01_sfnt_off0000ebcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCF 17300 bytes
SHA-256: d4723217ed6dfbc3fd38c40419d518902306cb00592bd301338ff9f72c71c30a
font_02_sfnt_off0001189a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1189A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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