Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b20acd96266bbf1…

MALICIOUS

PDF

113.0 KB Created: 2021-09-15 18:04:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 785f18a147791cb50322bc869be69b64 SHA-1: 4346ca11b3bd2081c9ea5e3e0a3d8675917e2751 SHA-256: 8b20acd96266bbf165f87b9f8e98514c6ddac3d585f991f506cc7d00514be3d4
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The document contains a link farm pointing to numerous disposable domains and compromised WordPress uploads, suggesting an attempt to distribute malware or conduct phishing. The presence of embedded URLs and the 'SE_CALLBACK_LURE' heuristic indicate a social engineering attempt to trick users into visiting these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://chcial.ru/uplcv?utm_term=dji+phantom+3+android+compatibility PDF link annotation
    • https://yuktogel.com/contents/files/61985908675.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/norixire.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/58723255102.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/91716898704.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/75024377215.pdfIn PDF document text
    • https://gameclub.by/uploads/files/89676606508.pdfIn PDF document text
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/51303211272.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/vadix.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/65549905734.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/bitugutaj.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/36044854677.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7e916b7b4---sobuwajifulamob.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/21618252252.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/76483685891.pdfIn PDF document text
    • https://agrando.cz/files/file/toxetevibomujalixeje.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/xijibogo.pdfIn PDF document text
    • https://hinaweb.com/upload/file/dizakufidu.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/83924393274.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613999c2a7a54---kotanasite.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/lumivogekilobemelevemed.pdfIn PDF document text
    • http://abpaluso.com/upload/file/79166302157.pdfIn PDF document text
    • http://tchid.net/userfiles/file/wuladuminikepa.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/93491219853.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/6626be37f0294c52864eb9599fb9ef26/wujujiwefunepit.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/jefobokoxitojizarogivob.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_off00015350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15350 11036 bytes
SHA-256: cb1f33107414629b0eed961637329a05e7832443a1f8eff5a27e027d1e0fe4e9
font_01_sfnt_off00016c88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C88 18768 bytes
SHA-256: 0373a6aab68807830cb4c5b11163c0db1ac802cf96b20c169d5f97a9561a5c9d
font_02_sfnt_off00019daf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19DAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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