Malicious PDF — malware analysis report

Static analysis result for SHA-256 58b2f43c65e38961…

MALICIOUS

PDF

75.2 KB Created: 2021-09-07 02:53:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a4f3f3c4cc16b1bce6c36e0521063760 SHA-1: 7f9dc2c2d233c3de88e936005105e1102fe34dfa SHA-256: 58b2f43c65e3896161cae74a1706bbb047c2b0957e3af4f08d1bb2af6cff1cb4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are structured as link farms. Heuristics indicate these are likely used for SEO poisoning or to lure users to malicious content. ClamAV detection and ML classification confirm the malicious nature of the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://editionsitaliques.com/userfiles/file/jenafewuzonu.pdf In PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16089082b9ec97---xademorarovu.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/xisevozab.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b1b07742d---kefipi.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/deviwepegawolosob.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/tikotigepuzajuguvif.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/62938129008.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/fijobef.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/h0s3ee0s53ucs06rk14okak5l7/nanelipegimupavi.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/73423290845.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16094b334374a0---mizuvoruladezom.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160d4918f740aa---pugumo.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/8isd92earvaaaafjqie8o5c532/25167823964.pdfIn PDF document text
    • http://objets.immoweiss.lu/userfiles/files/wafavisene.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/aba576a4f2b47f6218e082fd0ae61b44/lamaxutilifedigaj.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/gesuxotuzozemerulof.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/33524091601.pdfIn PDF document text
    • http://vhz.cz/user-files/vifuzemosotidirugoxepuwe.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/24769420937.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/21078098846.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16075ab97a1313---86919046466.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-6-29/20210629053627597342.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/rozeridovazomixusowewawe.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/66632479748.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=integration+of+modulus+function+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC196 17092 bytes
SHA-256: 901371fedcfa70361d379ba23023bcea8dab5d80ad935eb56f9801cecedca03b
font_01_sfnt_off0000edef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10606 11012 bytes
SHA-256: 0370cd208bbfd0f88eb4e9368f508765b00a16ee995d9dec51e97a918831a674