Malicious PDF — malware analysis report

Static analysis result for SHA-256 a52fe4f25a23c9b3…

MALICIOUS

PDF

72.3 KB Created: 2021-09-05 16:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 859ccc1db82a97574596754b1166b403 SHA-1: ad2510a2d5d8c54dcf0f62a662a4d9716a8f109d SHA-256: a52fe4f25a23c9b3828e8b4ea7f6ed50c8a79a079bababe2348531df82c7cda0
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. This suggests a phishing or malware distribution campaign where users are lured to click through a series of links. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://tjsijiqing.com/ckfinder/userfiles/files/2021/0717/0b00035652cec38a5ea3e1a964a96a3c.pdf In PDF document text
    • http://bodybybodyology.com/ckfinder/userfiles/files/89746062798.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae3c50f213---lorofuxotudoxipig.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/188da605f68d396f210a800a3566dcc3/mojaloboliriwatipis.pdfIn PDF document text
    • http://thallo-food.hu/uploads/ckfinder/userfiles/files/bafusadulax.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/ne9c1fctj324t7q7qkgpieimq4/99856750266.pdfIn PDF document text
    • http://meechoktoolmart.com/user_img/files/35500090324.pdfIn PDF document text
    • http://limitlessillusion.com/wp-content/plugins/super-forms/uploads/php/files/81fc942009ff582225985c110f9fb7b6/22505345154.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/c4152336e1c53feff05ee0b5df9271e7/72833858063.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/90644515885.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/26852857522.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c491fd6f908---41924775347.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160931fea3a3db---55406060392.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/zopalokexujekapevex.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021081221480773499.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/sobojekegezar.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa1fb7be0e---27425117448.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/xisigegarevoposupogirala.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/64087390422.pdfIn PDF document text
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/pifasomoleforepi.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161155e1f60c70---20923218721.pdfIn PDF document text
    • http://granitemountainranch.net/userimages/nuwafosonokobon.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/53580641818.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a44410c345c---27093371523.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=class+10th+civics+book+pdfPDF 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_off0000b683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB683 10884 bytes
SHA-256: a4e7f7f83831c43de6ec71214ab97610346ee853b1a0bb0adf2d21b123769889
font_01_sfnt_off0000cfad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFAD 17212 bytes
SHA-256: 6cb5d5a87b4763bf2e20cb664e940e31031a924a1dc0964c0af0ec08dd3c4de5
font_02_sfnt_off0000fbb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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