Malicious PDF — malware analysis report

Static analysis result for SHA-256 c162391d489ded81…

MALICIOUS

PDF

76.3 KB Created: 2021-09-13 03:28:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b0f9cba410565627a64230b4bc979c78 SHA-1: ed34cb191425ee3ef5e0393991d7df4d3292feee SHA-256: c162391d489ded81d37fd8ee292641f190f07ac1d46f769727a99409cc199eff
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier, exhibiting characteristics of a callback phishing lure. It contains numerous links to potentially compromised websites, suggesting an attempt to redirect users to malicious content or download further payloads. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://sts-cct.com/app/webroot/userfiles/files/92962312757.pdf In PDF document text
    • https://tenfci.org/userfiles/file/moxerulobu.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/87847553967.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/74765179045.pdfIn PDF document text
    • https://khoahoc.timviec365.com/picturesfiles/suwetezup.pdfIn PDF document text
    • http://kmjmt.com/news/upload/file/210913055531496844eh0g1u.pdfIn PDF document text
    • https://coolinterier.sk/upload/files/nitajusafewira.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134bb890c3b9---44284281498.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/79766016000.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/zokerewogobelov.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/68496086445.pdfIn PDF document text
    • http://sun-eko.eu/files/file/lubofigazejama.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/kozezirulilijakivukose.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/41687928513.pdfIn PDF document text
    • http://boldogelet.hu/media/64752120016.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328a249a4bc---zugibobe.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613cbdae5521b---90261916170.pdfIn PDF document text
    • http://fractinvest.com/uploads/file/49379274120.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/raziz.pdfIn PDF document text
    • http://csc-vietnam.vn/uploads/userfiles/file/90452635016.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/49232342952.pdfIn PDF document text
    • https://panoramamall.bg/ckeditor/ckfinder/userfiles/files/noxizegodor.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/wusasazolojatigenovi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=iphone+8+vs+samsung+s10ePDF 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_off0000be1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE1E 10860 bytes
SHA-256: 1aacf7e58d77449864a4986cb75720b7c16c0edcc9a077f53ec567eaf1bfb672
font_01_sfnt_off0000d715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD715 20344 bytes
SHA-256: 6d1a7902d71305d8dcd59cae3cd91159098bccb6e6321d0ce114477154ee0eb5
font_02_sfnt_off00010ba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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