Malicious PDF — malware analysis report

Static analysis result for SHA-256 b24001f5814a1423…

MALICIOUS

PDF

76.8 KB Created: 2021-09-13 18:42:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cba89a69bb9ccfd6f2680d8fb6302277 SHA-1: 7399db73929edc147f6651e2f187d61e5b009b43 SHA-256: b24001f5814a14235ea4334fc34b4499ddc0cef238dac957f020e14bec2af502
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF's primary purpose is to act as a link farm, potentially to improve the SEO of malicious sites or to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://crewmak.ru/uplcv?utm_term=open+eml+file+android PDF link annotation
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/59df6585ac2333b22eae856370200f7b/lafededosi.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///57126621102.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/76284520052.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/binafibi.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cbe5f4d87c---34041070532.pdfIn PDF document text
    • http://allefrgycg.news-read.com/upload/files/21560772283.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/jodedukafo.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/6829963588.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/sotijux.pdfIn PDF document text
    • http://fabrikando.com/cmsimple/images/file/74724974998.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/89839177576.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/11525268059.pdfIn PDF document text
    • http://canadianrockies.info/files/file/wemiwazudu.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/42900180035.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16133caca3906d---jokinupejefonuxub.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/lawavusiwede.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/09/12/60819155544.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613560536617e---mowulematitavakitopupaze.pdfIn PDF document text
    • http://lifebeachvilla.com/uploads/image/files/32077245933.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/6gt7jn0p568tq3mvenbvi0vhhj/ropazi.pdfIn PDF document text
    • https://smgbid.com/ckfinder_userfiles/files/xekapatepuwibolawegomopa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC912 17516 bytes
SHA-256: 61da50a4087c06e6d4d3749b8cb2dbe863299fe9ecb8765b2679c7199ba77c38
font_01_sfnt_off0000f67c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E93 10420 bytes
SHA-256: 2d8464feb5d3fb63f7e17ac5189fecf2111d48c7862c2ebcb58c9dc37f020954