Malicious PDF — malware analysis report

Static analysis result for SHA-256 5593fbe57b4ff67b…

MALICIOUS

PDF

85.9 KB Created: 2021-08-05 01:52:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 483d25e426e9b9b694dc1c350441e066 SHA-1: 0fd9e84332da05b23e39b65f835eba31b2484ed4 SHA-256: 5593fbe57b4ff67bb50a8498b8a0ebba06e7a503e0963d101512e4c7515a69e8
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to potentially harmful content. The document body is heavily obfuscated and appears to be metadata from the wkhtmltopdf tool rather than user-readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://almar-bus.pl/userfiles/file/xigafaletunijojadofos.pdf In PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/uqi79k3ov6i3nadpbpicsoc85p/pazujolajazigizetoxojax.pdfIn PDF document text
    • http://antasboru.com/guvennet/resimlerfiles/14773981956.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/nufok.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082447d73ced---ninupivibi.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/f0940fe034c884eeb30e6d0873a837e9/84738381894.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/52d1e0f780d7e002c5c8953b527c172f/ganodo.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160714fcbe0a5e---gidosivorimajegokomum.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/vomurizegavatexojezukakop.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d85d5b811---bujol.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c787514090b---gesipirixevuvugubux.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160958c416bdbb---wesoko.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160919a415a348---78363883256.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/ff1f7c3d45db3edc71022b6441bff0b7/93159088337.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800b968fb62---libawoluvipeduvemukadula.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/jenuxuxowarikesire.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca0e2bde36c---fedopudufaju.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/69639869793.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/ds1i0b9uroc0jeqkro2evcdbo9/45247113463.pdfIn PDF document text
    • http://makingtheturngolf.com/clients/9/92/925d9bae4ecf380f28dbe0e1390c16eb/File/tomatupodun.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/rabenafilapafatad.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/jajigunajisali.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/e9186aece0fe8b6dd484138921aa0f66/daxiruzabefezikomikaxed.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/fcf72a12df5cb00cf0d96ad15a0b1f96/xefosok.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/xekilivosamibudajobezodur.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/telazibogebi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=star+delta+control+circuit+explainedPDF 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_off0000edaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAF 16620 bytes
SHA-256: 07bd76eaae59f865329e0110d0646aa07fbfaed1f5ddcff6e09fdc9e3cd53f1f
font_01_sfnt_off00011930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11930 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13147 10616 bytes
SHA-256: c91d4219c826c6fd964b45216929a29288c9e96b714374706363f836a5d9de97

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