Malicious PDF — malware analysis report

Static analysis result for SHA-256 471a5188458f5801…

MALICIOUS

PDF

72.5 KB Created: 2021-09-18 04:27:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bd10d1c975ce18b7e300eae9a9e50553 SHA-1: e9fd5ca9dd950b1790dded99fe6ff3102313e829 SHA-256: 471a5188458f58010d3d7f6d089f3d7d45c459b471b63b9a51c1e9fd72ac7b72
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to direct users to external sites, consistent with phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://catamma.ru/uplcv?utm_term=music+upc+lookup PDF link annotation
    • http://mispuntossaga.com/campannas/file/pagixuwan.pdfIn PDF document text
    • http://kietminhrivet.com/upload/files/69296566242.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/74977571919.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/12482616765.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/tokavawes.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/cbb770e557425ee38d0dfff0309ed891/5392722924.pdfIn PDF document text
    • http://reflita.lt/uploads/files/nijavilazulowumes.pdfIn PDF document text
    • http://mybed.tw/uploads/files/202109121735344837.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210905063628204728d1ryk6nnx2hi.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/lefipotavelexevamel.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109031617173117.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/88756880344.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/ece5d4f4146fd98b0a0b5c3ce1fdac37/wilukasaverofoj.pdfIn PDF document text
    • http://st-communications.com/ckfinder/userfiles/files/92233924555.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/89647007632.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131626a5d4db---123461180.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/punutev.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/dexixamezadubenororebepe.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/69447289811.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef885a6635---80270746412.pdfIn PDF document text
    • http://remobudostol.pl/pliki/dulazewip.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/41712473710.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/51179110016.pdfIn PDF document text
    • https://latgalesamatnieki.lv/files/file/82850923120.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_off0000bab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAB7 16784 bytes
SHA-256: 4a3edb43e2764d99f2be706edbc6bc74528116b9df4a6e27d6f2eb31a6cef670
font_01_sfnt_off0000e622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE622 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE38 9956 bytes
SHA-256: 023a0d35eeaacb3aa0432473bce1f29335652eaa4e1ea72fa3eed95a57e730f9

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