Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bbde4e85d924aeb…

MALICIOUS

PDF

78.1 KB Created: 2021-06-28 08:12:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0e76058dca33c874aeb8d66b094ac054 SHA-1: 7327dd1f18e1f429507d772afa34714ce5ebb6f8 SHA-256: 8bbde4e85d924aeb4b1d17b66aaaf1d9d673c7206936e65c55231173325620a2
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The document contains a link farm pointing to numerous PDF files hosted on compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://wastran.ru/uplcv?utm_term=johnny+rivers+midnight+special
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/dadh04bdc07d13ad5m9us6o0lc/digidanarobeburugabefu.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bafe6689fdd---74282834313.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/099dd962d27fa8d67a59e0a1158106c9/momufal.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcf8a48386---67833965490.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb5c959017---xokejejosesijora.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ipkhibs49fdg3fchgpb0p5nsqg/59035986778.pdf
    • http://mtsskzy.com/userfiles/file/janebofiwuzupomuzopem.pdf
    • https://briljant-maleri.se/UserFiles/files/35121494132.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/9ca6f727ff377b50eee3897e0cec65a4/zikafota.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608867fe5e390---bifidazusaremijesik.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8745887d54---26169984348.pdf
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/h1lhukhuusjl5v3k9i0mgae7o7/leperugaxo.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b248cddf5ac---zelubuwon.pdf
    • http://gsxr.hu/userfiles/file/76013096030.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/jhfeu4m1vo0d6fkgbkp48292g5/zigig.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/f487633ceba65e197c00d5201e625c5e/54852771278.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c613715c7e2---42070904236.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160758d7a5decc---govesutezofegujuwor.pdf
    • http://bocghebinhduong.com/media/ftp/file/77068804510.pdf
    • http://kleinschaden.expert/userfiles/file/42328863390.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/251de4fdac96737979df03be62e88b1e/dipogimonazeweb.pdf
    • https://catequesisnavarra.org/guiarte_userfiles/files/rafelatinogovoxemugojege.pdf
    • http://diysmart.net/userfiles/file/16283621768.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_off0000cb88.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB88 16792 bytes
font_01_sfnt_off0000e39a.bin
18a854f1fe9c84abc383e6054e859b580c869e9bd376b66df622e404929459fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE39A 17712 bytes
font_02_sfnt_off00010fe1.bin
46e06e79c259eae150ffcc4453888eb8664af934a8685545f7aa10706560b209		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE1 11132 bytes

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