Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c5c46f16b2ca503…

MALICIOUS

PDF

74.6 KB Created: 2021-08-26 19:52:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c14a4ea75412ab85c1597b1a0cf1c51f SHA-1: f854f939c52b948f8399f4c822a5ed37ac3437c7 SHA-256: 7c5c46f16b2ca503c5660988e38171625aa01e413d3fcc458b8b69f4776ac203
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to compromised CMS upload directories and disposable hosting domains. These links are likely intended to redirect users to phishing pages or download further malicious payloads, aligning with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=rm+to+eur PDF link annotation
    • http://khamtribacninh.com/images/files/62734695407.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/76a71e82215effa3d8c34492fbd2849b/sosuxu.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/676b4c0358f7ac569949ceb60dea174d/pekefuxovuwiwojowofu.pdfIn PDF document text
    • http://tfforming.ru/d/files/23606293837.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/62281385762.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/d3oft928t34kdnt6ulcm2ium53/zununake.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/kemivur.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160773c28e99ee---25604792184.pdfIn PDF document text
    • http://lhs60to70.com/clients/3/32/32806278e47d7e4d905c37b1d6ebf04a/File/walonuxowax.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210609_35F272A37742A7A5.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/31573307636.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b679c378a3a---fimugutuni.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774cd9b1a40---velazizekasaluri.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824bac1c4e3---87713947660.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/56aea4f5b7815ffa8492f2f909bd49fa/26761740923.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/s8hp1kjppigdtvlpoirug534dr/patejopajugosevivotap.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/zodobuguwaxaxuloditixol.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/23104868074.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609063033e5bf---76647321450.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/15175256552.pdfIn PDF document text
    • http://piau-po21inn.com/CKEdit/upload/files/fukax.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/b0e08538d26737f16bcd3076835fd266/zapavojamupif.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/47379276862.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_off0000c6d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D0 9840 bytes
SHA-256: a6013ce98cd8c37062e10aa8ce07a1c9f0509ad048e9ba530b40f1f03ea98b4b
font_01_sfnt_off0000dc78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC78 15184 bytes
SHA-256: 231f3cf8b3cc9698c155f0eb32ece0542eeb5f32f8f6c33b4621a98e8e0c2769
font_02_sfnt_off000102bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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