Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b607448203e1ab0…

MALICIOUS

PDF

80.9 KB Created: 2021-06-27 00:22:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a81be5c95d164c839fb798820e019151 SHA-1: 8eeab4172a4e27fd3ec0a9bd0f1b6ab4a3a30302 SHA-256: 5b607448203e1ab0b9f24a104138db933f5d7c1097a0da3a3a81373c113bd875
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure as a link farm suggests an attempt to lure users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=grep+with+timestamp+in+unix
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/86e59938ce9c2ab22f59a6bb8921304d/60571602895.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080ba1bac5b7---wavulig.pdf
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/1c8aa3779927c908210f41434987056c/sudodilu.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b65b610e03---fomuguripugilafunal.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5bfe09e5cf---wezupasomifekenevasopip.pdf
    • http://agiusfuneraldirectors.com/files/file/95554159711.pdf
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/02702509e36cdfe07339e6f89b577d2d/59109650236.pdf
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607b42471e4db---dodetobelufuzi.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c9185788500---67636925156.pdf
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3959e6054---napofavotorekimipiruzo.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/f6f20337eefb2c391b437a96d12d29db/34351948845.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d9c81ac05---fomikusuw.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b286c82b3---povavavigeva.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/s58m3855ocstedjo2omgdjijbd/16122362259.pdf
    • http://abc-tel.ru/data/File/35761903890.pdf
    • https://majorsagilekvaros.hu/uploads/file/54684060042.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7fcac0f21---waraledogedos.pdf
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dd206090c0---woluxolikepom.pdf
    • http://sl-light.ru/design/img/upload/file/suliwekaluxofirake.pdf
    • http://tillmanfamilyreunion.com/clients/b/b7/b7385abc5988d1ee605fea7695e3d00e/File/kotufezagamatupere.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609883beb7822---gazekonaxixal.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4519a9f8d0---69807809723.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a730fd19e22---xokeduzugovotelilititowan.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dadb.bin
307e3ba3094d40c220a132f4d5d3f19a752bc51de8699f04b4d28008df1cf740		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDADB 10680 bytes
font_01_sfnt_off0000f34b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF34B 16792 bytes
font_02_sfnt_off00010b5d.bin
1b348ee5a5cfbbad038e8f44cd1137bbd3897972cdd1ed9b904ddbc433fff869		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5D 16588 bytes

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