Malicious PDF — malware analysis report

Static analysis result for SHA-256 21024c7dfffe939c…

MALICIOUS

PDF

97.1 KB Created: 2021-07-15 23:31:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 5e7f7d80c2480c182c363fa38a7d5dd3 SHA-1: 77803dd42fd2f3b8af9eefc0fa4c23f388588450 SHA-256: 21024c7dfffe939cacb77ec5ad3d076c7e9c641d8d3d9064a764d5607f5baecf
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links to compromised CMS upload directories, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what the heuristics reveal.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://pistant.ru/uplcv?utm_term=seraph+of+the+end+vampire+reign+anime PDF link annotation
    • http://sevoir.hu/uploads/file/52360238012.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/d687c789b6c5af6c06e72571439bfd0f/93753594460.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/92990088581.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607d57f9bad10---pumeti.pdfIn PDF document text
    • http://goodslib.com/userfiles/files/35748368029.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb3a7bb472---86950400641.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/36921d56c2aec9266b458423d1163278/logiluwojaxapujade.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/bekenazoraxadinikovofibav.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/j1cfdhg73lj5jfmpm44hibdmsb/41271469255.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ee6383eead5---xivojilenatomekafin.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/nadalukivufigiraguf.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160827fe70eea8---86858136501.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/zuwerano.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/0977590f0d1370c0af043e3e4271d27c/wulivizivolasori.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985b320cfe3---31957878536.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/a5321e6dc1484b7c09f88771aff7e78b/wupowow.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/a1tcfbve56imn5rtthiapd0j43/senopogerobuza.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/wiselemakeza.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/23844127281.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/88676390010.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/35301173678.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001125c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1125C 27392 bytes
SHA-256: 6b2f7684856ff6081989ef33d028d0bf6e243c13afff3cac22e4c24ee4b00119
font_02_sfnt_off00014b06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B06 10872 bytes
SHA-256: e4178fa668586cb298812772be4876401e8ad043f53e7e8b88b34ae1f30f0b08
font_03_sfnt_off000163b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163B9 4496 bytes
SHA-256: 6c6a8209ec4093f8ec4b4c197549bfcf5b40cc0ee96beb06bfb9a96cf6030ee0

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