Malicious PDF — malware analysis report

Static analysis result for SHA-256 0db6cf49b31d9a39…

MALICIOUS

PDF

88.3 KB Created: 2021-09-08 10:38:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e07ad46d4db5b1a24ba9a4622e0ad357 SHA-1: a559682ac7c1d5ac1b9f67716053e243ce2d805e SHA-256: 0db6cf49b31d9a39f69f15fb2bbe3351c2d9ed77ff0344ced1b39f9e77b65315
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_CALLBACK_LURE' heuristic strongly suggests a callback phishing or tech-support scam, where the document prompts the user to call a phone number. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or social engineering attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/1fac038d16dccc3af200b0656e2d7d55/68195743328.pdf In PDF document text
    • http://novichiha.ru/pic/file/35338862193.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/214631344060fef5971e5bc.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bd663e8d347---43361191629.pdfIn PDF document text
    • http://sanraimundo.cl/dyn/uploads/file/rokodekunozekega.pdfIn PDF document text
    • https://xebecdesign.com/xebec/userfiles/file/14071626326.pdfIn PDF document text
    • http://yoron.net/up/files/jesijoliwuzazuvimagi.pdfIn PDF document text
    • http://linker-apps.com/files/paludibepurafaradu.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/55538363983.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/pulufimefiruwifepusawe.pdfIn PDF document text
    • https://cplastik.eu/data/cms/file/zadafibofuxodebifa.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/239a5bfef2388dcc8f7fecdb79700fd0/bufukes.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/fowoxeliwepudivu.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/zaxelanikidizebinokodev.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/nuxekumapawud.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/12103476816119d6429a77e.pdfIn PDF document text
    • https://futurefacesmiami.com/uploads/file/88759959098.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210808_2c619.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160986919656ff---kosusuput.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=lenovo+thinkpad+x1+yoga+3rd+gen+manualPDF 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_off0000f72d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3F 16684 bytes
SHA-256: 8a2e0d7c6507d55a7c7c7284c195228277250abd66d18df5ba4911985cf4f4b7
font_02_sfnt_off000139da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139DA 11324 bytes
SHA-256: f9579a4068109f11873facb6f05cde71a433049424a55592d5b814f5b29f4b8b

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