Malicious PDF — malware analysis report

Static analysis result for SHA-256 7167183c7f3d5326…

MALICIOUS

PDF

99.0 KB Created: 2021-06-19 10:51:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 017924d22d25b0612c97adaf76e15711 SHA-1: a0d8cdd055ba0ae904cc50f39b24334836507902 SHA-256: 7167183c7f3d5326014574b22d7575dff42bf0337a8d63016736b905e6a4b366
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/p48gii21fqgsvbrg404f2uo0o9/medulerazalixafikunifeje.pdf In PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/27520141532.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/32682408234.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/25d01f4d15304a923dfb84dd9f73ce8b/lumawabevi.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096de213d927---11338569241.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/pijufifonos.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/7461421188.pdfIn PDF document text
    • http://wenxuezj.com/images/File/6464389804.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/49eea8722dbcb867a27148b092dabc62/59890346262.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/26khcn9k8duh040h8de8rk99lb/sadewativunad.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/tajoxaxanejifobukesadafu.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/coi71dr26kaclgkpm0qt0qmdr5/vuduridebebunenarirex.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/bcd953a6acd3982b4816955e9ad58be9/jiremafanodokozubidi.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/3e5577021b61877f9bee7a9fabab8530/lonede.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cabb78720a---fanemosifepafezumog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=princess+robot+bubblegum+all+episodesPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011c1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1A 5712 bytes
SHA-256: eb6f26bf949a9bff35078a0aef8d5248f7f1d41212434794ab43584ef2c54506
font_01_sfnt_off00012f87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F87 5536 bytes
SHA-256: c16dc757aeb93920fcdac68f444a68f7179fe1953fc8657cb991b0f3470c3335
font_02_sfnt_off00014234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14234 15632 bytes
SHA-256: 1cef295208e2f4bc50aef455513eaeb17a54324aff463d7cf0a7d825cf9511ac
font_03_sfnt_off000170be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170BE 3536 bytes
SHA-256: 19e9098a81925048ba3cc04fc8b6a51c07157d947bfa757e8a8e166c2934da7d