Malicious PDF — malware analysis report

Static analysis result for SHA-256 c41052ae5b30083e…

MALICIOUS

PDF

109.4 KB Created: 2021-06-26 11:06:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e747e2b270379ead41a167d20764171b SHA-1: c6a269f3e1b054ac0171755bbf3db4ae108a4165 SHA-256: c41052ae5b30083ed949c7672a968a136c9e21e2635c49e0c234231325e4d8ed
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external PDF files hosted on compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9756

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://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afabe1e6627---wogag.pdf In PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160860a4855436---79597065070.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/82196626848.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/7cjflhr17iqhl06e3rrb46ojb3/6489506402.pdfIn PDF document text
    • https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/47e4d4540ac785946ccb9ab57418feb5/zoziwi.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/jegofezedotinixiran.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/pevezamonasopoxu.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac661784646---60211121627.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/4941acff351ffec88493145aa296c489/jofaripopaxavero.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e0daace32---besotadi.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608002cc458fa---panebetoxupe.pdfIn PDF document text
    • https://bdcomunicazione.it/file/42377686305.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/8a4c3golm2qshjkd0emcnm1s3a/newire.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/46908712772.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/vifirirolawalonafoni.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/o93nlq6p2516jlatfm68hek9rr/debuluxer.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/7400929919.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/ferunaforufelojos.pdfIn PDF document text
    • https://masihpt1.com/contents//files/23111667787.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b922c0526---gevazis.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/a83d343a19170b5c0e4fa3e1cf2af759/26575530054.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ab599bf6f---22754311105.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8397bf59e598a7c40771356803ad40b9/giguronuzupu.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/295a0ba0f1dbd21e76a55dffc82de380/36574200219.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070092d2b64e---32369830122.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=meaning+for+viablePDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off000186c9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x186C9 18756 bytes
SHA-256: bea10b4fcebf6aec0effeea9dea89fe39f5941e79d0e41a975e246f2d39f5f6e
font_00_sfnt_off00010a21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001222e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1222E 3464 bytes
SHA-256: a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff
font_02_sfnt_off00012fae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FAE 10324 bytes
SHA-256: 5db931d37441bbb625b6e0a8f324dad8b15c03a77681988d438ec4bb62a29633
font_03_sfnt_off0001470a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1470A 26300 bytes
SHA-256: 5954eeac58596d9b7ef0df493fd802338e9279ecf10cf51c7324f6f2e3a6d0d1