Malicious PDF — malware analysis report

Static analysis result for SHA-256 98ccac8587776344…

MALICIOUS

PDF

85.5 KB Created: 2021-07-04 01:29:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 701f089eabafb0b55e8c76e1d369a078 SHA-1: 78e9dbf07b76bf698557c6d0466bddf8784bc7bb SHA-256: 98ccac858777634413b304cfff012e8940d963f84f9ca78db2a26acdd0c20783
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised WordPress installations. The presence of these links suggests an attempt to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crysiq.ru/uplcv?utm_term=when+do+dogs+go+into+their+first+heat
    • https://burkina-businessschool.com/business_school/uploads/file/sozeguru.pdf
    • http://ud2-140.com/files/nerogevisimipumavalizoxum.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/c90944fcf6188e06790622253243e7eb/kanezomametoruwexejumixaz.pdf
    • http://domingo.hu/ckfinder/userfiles/files/94576159851.pdf
    • http://cci100.com/clients/57496/File/lesilivunitunefojuxo.pdf
    • http://lubrifianti-auto.ro/files/file/kakufijomanepusibijuxo.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9389a0d4c---13919249331.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a3db43fe7---xokolaxijan.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/j7sidlglrcn1g2u4u0iop4d3a2/38948498414.pdf
    • http://hgbs.de/userfiles/file/46598301262.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/49097452ccd57b333241730af36172b8/sutinoguxe.pdf
    • https://cosplay-expo.it/ckfinder/userfiles/files/90918408274.pdf
    • http://firmykominkowe.pl/Obrazki/edytor/file/xumixirugebosagogurezot.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16097ff64d99f8---loniloje.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/275815e4307d29b52d96188ca55538d2/vasamixote.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9fa2d37f7---60374300360.pdf
    • http://www.vegagastro.pl/upload/file/dejadezixame.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c0fb9869f14---91909696443.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/jf23ajsk9jd4odf1llpvqngc70/74672634798.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebe55575be---21980445938.pdf
    • https://mabuksusu.com/contents//files/dufefa.pdf
    • http://bluecreator.biz/ckfinder/userfiles/files/69149090250.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/494c80cbabbe4ed18fdb22a8e2fa30a2/6863081196.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/4c9eeaf043809e568bd45fb6da254126/54880405193.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecf7.bin
a4e351c10af96381928624c03c9291ceb3ed25b6b3ec3d6f823a0ea54fe7bc0a
pdf-font-stream PDF embedded font (sfnt) at offset 0xECF7 16728 bytes
font_01_sfnt_off0001185a.bin
eb5f93c7f3bd081d5998ca8e584ebc21746e6ebd3196d5e9cab0114f725c034c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1185A 10580 bytes
font_02_sfnt_off00013048.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13048 16792 bytes