Malicious PDF — malware analysis report

Static analysis result for SHA-256 59f1d24876bf11b9…

MALICIOUS

PDF

84.8 KB Created: 2021-08-27 06:50:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b35d3b9bf16ec68fd0a14d71d8164e8a SHA-1: cdac22a742d5ee388614d5d898c40bd3e3f2826b SHA-256: 59f1d24876bf11b936f3c409bff6b24f1661ac25fb07594ccbf1f424ffe467e6
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal One-Time Password

The sample is identified as malicious by ClamAV and an ML classifier, and it contains heuristics indicating it's a lure for credential harvesting, specifically targeting MFA or one-time codes. The document body is heavily obfuscated, but the presence of numerous external URLs, many pointing to compromised WordPress sites, suggests a phishing campaign. The primary lure appears to be a request for a one-time code or MFA confirmation, consistent with session token theft or MFA abuse.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://irlanc.ru/uplcv?utm_term=fill+out+the+registration+form
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dac4bedbccb---21897780368.pdf
    • http://benetworkingpro.com/ckfinder/userfiles/files/97301786718.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608599a4a8a51---2613112272.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/mvg0rjdmrigj6t2vt244pl6m07/xamavu.pdf
    • http://olynskiconstruction.com/pics/file/89987662683.pdf
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080370e76d3c---tizutotolaxolepixamute.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4c455b05b2---nanagexupiterilisude.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/0d09d88b718248511113ff443b21d961/zezul.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2819bd22da---kamuzomekaxefijeg.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/94344d0d9c8212eb481d92cbc6b2cd10/vomotofidumafejefekizefol.pdf
    • http://teplospectr.ru/images/files/37483521565.pdf
    • http://jjmcp.jp/userfiles/Image/file/82797641064.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/84cdbvhte91hei30g10blvfpum/65118240347.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b93d58bc0---tidapodotamizodixejalole.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16115671a492da---dixagulo.pdf
    • https://tanthuantelecom.com/upload/fck/file/60068372889.pdf
    • https://boucherienabli.com/uploads/FCK_files/file/28370205712.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841b425cf09---47275520600.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/daba165ffc04a855ff2c82eb48505070/tukosobobetutozamufeg.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160773cec60b9e---87002772472.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab53c44e6ae---wikefusimatasigun.pdf
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/3calq0lq1udgog547qdbat26l0/98465352651.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_off0000e7c9.bin
d33de5e1d77a9cbddcd0fa68cb7af4ac25252607dee4a490db4b913e7024992a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C9 17120 bytes
font_01_sfnt_off0001141e.bin
72204c1f7d858725d63259c57547f342e2def17fd30424089d86a024160c2978		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1141E 10736 bytes
font_02_sfnt_off00012c94.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C94 16792 bytes

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