Malicious PDF — malware analysis report

Static analysis result for SHA-256 13189b4ca893b9a4…

MALICIOUS

PDF

72.6 KB Created: 2021-09-08 01:48:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fe1743a83c66cfc86b4cd4a5977ce6bf SHA-1: 538b06e6d7cb688020243a855056e912240aec0d SHA-256: 13189b4ca893b9a48579484906f7bc2451d490c8dc6eb04709c00cb5d21dee93
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories. These links likely serve as lures for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://soalmatematik.com/userfiles/file/67848369833.pdf In PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/wixirawuwa.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/6015fd5cdb14838ec8d75dbc3ac90417/likobarotewuwo.pdfIn PDF document text
    • http://metallpress.info/files/38638811314.pdfIn PDF document text
    • http://jogforbigt.com/clients/6/61/61f7a61d17da296148a50ccd59c4a139/File/29232372208.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df7140d8ae---wokawu.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/fl5ma9rjallmkvlfg2tq3tmel1/zubarikepebidudexumakawud.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/hvuvvgungji8bd69j865m1lvll/1173135716.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/61894923202.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/kolr6ct2qud7a0vqaksrse1sl1/falesojivirulazodezezaji.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/10307813508.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021090712342673499.pdfIn PDF document text
    • http://sumnerclassof1976.com/clients/4/49/49b54eafcc86ae0c30eb104ab8b91c7c/File/gopizavarurifa.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d84e29b0c---xapup.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/93b9789630463778afac4c6dcbce52af/jaxunubigerosumalexowi.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/eb8be7792719ca5dd8ebebead7d570f0/wigolodu.pdfIn PDF document text
    • https://birudongker.com/contents//files/99560457200.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee67c051e1---zativiji.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/2bd3f9d59592cc647f577a88488a5d9d/79119443822.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/14332204201.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/fopaboraxuwupagutoriz.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/98271579287.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=esercizi+grammatica+italiana+per+stranieri+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_off0000baea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAEA 15992 bytes
SHA-256: 4357c37b7796a17115b0814760ecaef4af1a050a77b09bab3a51ba2a9582a635
font_01_sfnt_off0000e38b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA2 10888 bytes
SHA-256: ceb35c1d490a527dd8b8bd1f909b28d05722f5be5d9d6bded2d1ab7cf9a4f65d

Open this report in the interactive analyzer, or submit your own file for analysis.