Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ff13d6882a31644…

MALICIOUS

PDF

97.8 KB Created: 2021-08-03 11:31:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d32dd540924f040c83746a7cade90016 SHA-1: 5e99027e957b68fbd8349962eeae05c7280d1e5a SHA-256: 1ff13d6882a31644f1dd03055072d21cf648de7bba3b20dc263419dd4c63a86f
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous URLs pointing to compromised or disposable domains, which are commonly used for phishing or distributing further malware. The presence of multiple external URIs and link farm indicators strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 http://xn--aknmedical-yub.com/uploads/file/vunerodixepufevuv.pdf In PDF document text
    • https://kompaspt1.com/contents//files/93831580185.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/81765587865.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/80276458213.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c77ba36ea71---pakufixetolopozuf.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c83f47ca87---gifubuvokuroxozokipobe.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b9beb1d71---84482606496.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/wenafaje.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/10983174164.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-7-3/20210703155025603042.pdfIn PDF document text
    • http://kossuthdigisuli.hu/userfiles/file/kizir.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c2ec974a4---67909861061.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071bb7992c7b---47713760768.pdfIn PDF document text
    • http://leesfeest.nl/leesfeest/sites/default/files/file/wugabarakijepaju.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/58139d390859bd6774a93c2762fdc1ca/ragoxebowivugapulozexedo.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7e7373842---panolofewijix.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/22164639335.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608244c3d07ad---noxepuv.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e49737188---wozokavurenizenavanigopa.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160924539dc241---lozunezazixob.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a02d13455b3---xaxopubadajeratel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=marriage+certificate+format+maharashtra+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_off00011b3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3C 16824 bytes
SHA-256: 3f3262733b8c8c686873036b4731cbee8c7ad34f7cf5c2d8d275730d339ba7d8
font_01_sfnt_off00014711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14711 10908 bytes
SHA-256: 0d113bc1d29bd6547fce3c9473691b7b0f96c31102050ade4cae9498fac8945f
font_02_sfnt_off00016027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16027 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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