Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc6450cdd8091ca0…

MALICIOUS

PDF

90.4 KB Created: 2021-07-19 01:08:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b9b4611d1327f17ae00db35f35b93770 SHA-1: a0d4a5dae6c0136b720194b5691bff1f6d30dd3d SHA-256: bc6450cdd8091ca0c7fc0d88826cae19e867e8e5a6f94f019dda7b46c1448d95
176 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan delivery mechanism. The document body is heavily obfuscated, but the presence of numerous embedded URLs pointing to compromised CMS upload storage and disposable hosting suggests a link farm designed to redirect users to malicious content. The 'SE_CALLBACK_LURE' heuristic indicates the document likely prompts the user to call a fraudulent phone number, a common tactic in tech support scams and callback phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1609b79e0be61c---16437258320.pdf In PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c14e9b2ce74---29595415367.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/a0f3670c5957a800a154379955e9e9f9/wotuduw.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210713152018_y4xr78.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210530055625_1515540049.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a39f2a8153b---tifirikazira.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/403ea17e28c9306bb89bcc944edd75f4/72700627872.pdfIn PDF document text
    • http://plncse.hu/php_data/file/87257018397.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094bd610e607---diligunovasipuwinotugod.pdfIn PDF document text
    • http://debeight.net/UserFiles/File/xotogozugorovenoxiwubef.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e19a2c1481---ruxonujirisewitubovezux.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4d2d16516---bugosimezi.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/ns2cc8eb49soctgm6mt56qjsfc/pevajineb.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1e5ce1c10---85985698213.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/75ibnl9kji567keo3k9c2epeii/godevoxunuviwij.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/9de003740b9c6a5cc7df3f88fa1b35e1/49103185206.pdfIn PDF document text
    • http://tms-technology.com/ckfinder/userfiles/files/73617279583.pdfIn PDF document text
    • https://topupdana.com/contents//files/tanewusakadokun.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/4b054c21430bd93d3011ef7c48bd542a/jadimonagezujoxo.pdfIn PDF document text
    • http://ozona.pt/wysiwygfiles/file/zenopuruwamafelino.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0cb7b2ba4---82339541055.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/c51ad1121ce8d153ecfe49fee9c8ae21/xibiluzovij.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/54813097344.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=igt+s2000+troubleshooting+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_off0000f922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF922 10988 bytes
SHA-256: c0adb945b8a09e28379033602263cf42f0a055f5dd33c656fc016d80ad200878
font_01_sfnt_off0001127b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A8D 19188 bytes
SHA-256: 3ec90bf2d1813d3f741c3b21ec84e5f29019ae8546b9a87abbf9202225ef402d

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