Malicious PDF — malware analysis report

Static analysis result for SHA-256 1434817fb3fba8f3…

MALICIOUS

PDF

71.3 KB Created: 2021-09-13 21:04:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 794410226b65980f2a03c494f3b66274 SHA-1: 9e6eeb4183ef7f55b19fe1c00fefd0d49fd78ffc SHA-256: 1434817fb3fba8f376ed8f70b3aaced97ee7512a2ed1485d5f1cb551d6d9ad5c
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be link farms or potentially compromised upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of callback phishing lures suggests a social engineering component to trick users into interacting further.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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) documents that carry no urgency or charge/dispute escalation.
  • 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://huntic.ru/uplcv?utm_term=swift+keyboard+pro PDF link annotation
    • http://wxhsbl.com/ckfinder/userfiles/files/20210912_110837.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/55937339173.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/davodibevavam.pdfIn PDF document text
    • http://marjoleintje.nl/include/userfiles/xepabezexo.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/vipumixigivalosage.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/33421281096.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/rojetid.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/8880660562.pdfIn PDF document text
    • https://tekmaker.com/upload/files/56041551684.pdfIn PDF document text
    • http://pk-rowery.pl/user_pict/file/rixarejup.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f3ea67f57---kepidebubeso.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/genonet.pdfIn PDF document text
    • https://edarky.net/data/file/gepofojudubufevakokira.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/fokibuvewogo.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/fa15cc54a2ede9ed07acc1626e293eba/salujagijiposaf.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/70659281539.pdfIn PDF document text
    • http://ebonit.light.bg/includes/libs/ckfinder/userfiles/files/migijogelawonuwiwip.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/donovu.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/88367449988.pdfIn PDF document text
    • https://blokhol.com/upload/files/kanis.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/75712954408.pdfIn PDF document text
    • http://boston.pl/fck_pliki/file/dofekokavimexorasalavuli.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/72404845737.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb4a4f2242---68220302688.pdfIn PDF document text
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/8990582528.pdfIn PDF document text
    • 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_off0000b8b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8B9 10680 bytes
SHA-256: c4551b937d323a5c70d7a2d67fcc2c038f7a881dd4594ac6af0aa9cddf8a65f6
font_01_sfnt_off0000d13c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD13C 15084 bytes
SHA-256: fdd945ee3b3af54bfb1077894bb437314722b4dcc5cef01e8a942b124cbfe834
font_02_sfnt_off0000f747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF747 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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