Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b15845c10b42a36…

MALICIOUS

PDF

80.9 KB Created: 2021-06-28 00:26:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: e42df2074e79312062cad797e719066f SHA-1: 5658c2a6f2205d1fc8235e108ccb935792202f83 SHA-256: 3b15845c10b42a361204923171574110c45d1ce87546844617136e9781d0d0c0
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The 'SE_CALLBACK_LURE' heuristic suggests it may also be used in callback phishing schemes. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://arrayamed.com/userfiles/file/banuditepolesugox.pdf In PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947be2ad587---23489629288.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a11a24d6ef5.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3254c4b3e---texobazajivugukof.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160838be05ce8e---14122602275.pdfIn PDF document text
    • https://taxiparga.com/wp-content/plugins/super-forms/uploads/php/files/dc95d6b7ae4e5ffadafaf3fc58087e7e/49099621135.pdfIn PDF document text
    • http://deepakbatteries.com/uploads/file/dovuvako.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/99771877295.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b9532f079---65360164042.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/141c6b45136d091c3e4e16286de1087d/32356266710.pdfIn PDF document text
    • http://poorclarescork.ie/images/tikufo.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/21393169976.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/eq9ovmj1gpportcmgl8c3e3p2g/10444437699.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/72699786953.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/dc69f1d02421444b17c6b1512bb14315/12556243781.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/bekegujugubepomevewoxuju.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/95248130138.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/6008cf27b177b9295749b7261a63c9cb/lawatajureguv.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/3515ae365bd9734eb41b35f7d3a9533c/tomesewako.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/9a6626e42c6425037224d165d6214c01/32943780436.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/30611493781.pdfIn PDF document text
    • http://busanpc1.com/upload/fckeditor/file/32791672073.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc73d9ef6a---98996759407.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/6punepgt1ml56fn454cmb5m731/pesulopexajomavijonela.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=silver+ring+hs+codePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d79b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAD 17972 bytes
SHA-256: 70ec8168c3ea402528f9f0041b032196f8f0e6a5c599420d20f4f9a2a54378bf
font_02_sfnt_off00011f08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F08 10528 bytes
SHA-256: 5f5fbb7763da7ea052c1a4a8a573b7898241b90326e8a34408e3a8ab67641273

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