Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b1ca7d3671f6be8…

MALICIOUS

PDF

83.9 KB Created: 2021-06-26 00:59:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 784d26724f8fbab4119548cb11dbbb51 SHA-1: c2181582e52e7c9048fe006ac6536d6d7807ba1a SHA-256: 0b1ca7d3671f6be8a2107c03bc4c57f65c98bebc677ee35ed6a9351a4b4b3efe
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics suggest it functions as a link farm and a callback phishing lure, potentially directing users to download further malicious content. The presence of a password-protected archive lure further supports the malicious nature, as it's a common technique to bypass gateway security.

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • 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://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/747aca3b13766606a770473e6578ce6f/zetutuguturilujunisaref.pdf In PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ac40e6a6eda---68659959874.pdfIn PDF document text
    • https://kajariaadsevents.com/admin/uploads/file/sowizepegagidemidora.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/84546346256.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/semexisorefabikavutamita.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/dabaxorejisitofulinexom.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc242434c0---mujamogeve.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/lisonetulitik.pdfIn PDF document text
    • http://juentai.com/userfiles/files/6011602269.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a015dbca724---kabilikaju.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef15919d14---tilubibovaj.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/78b0771627c0e1dfd783372542d26bfc/nilopulegulodudoxuboj.pdfIn PDF document text
    • http://drironcat.com/images/file/86346658587.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/sotefe.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/xudowebisaresazipuda.pdfIn PDF document text
    • https://eventaipei.com/upload/files/kirapunexa.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ded630cfd6---94977928471.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a1e2e5fbc---ramul.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/75725625582.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca1ca241c9---87699629602.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dbf1f4db04---mizozodekerabukulofexosiv.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/63880783408.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/zixefivadowepuvodorifu.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf965137b69---funixokub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=weakness+for+customer+service+jobPDF 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_off0000e29b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29B 17528 bytes
SHA-256: a5fc058ce51f1f0d80db6fc004c0faa86d3a03788f1e10c21bbd1bbec59cb6ac
font_01_sfnt_off00011088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11088 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001289f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1289F 10972 bytes
SHA-256: 9b6aa61c6254763302999e02d313e03c249e97693353d6013543c760e581332a

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