Malicious PDF — malware analysis report

Static analysis result for SHA-256 07fe8b4cb087ccca…

MALICIOUS

PDF

87.6 KB Created: 2021-07-07 04:26:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fed9f06759a464e40c3caed2efb38515 SHA-1: ddd5a265abf9e6d0e4e2c91b47b07f012caad791 SHA-256: 07fe8b4cb087cccabc2fe5a371b2c8e326eaea916d83abbb4504965a4fe01d7d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple distinct hosts, many of which are compromised WordPress upload directories, suggesting an attempt to distribute malicious content or phish users. The presence of numerous PDF links on disposable hosting further supports this. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://stellamaris.cz/userfiles/66951116982.pdf
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608ade0a8d6fd---81271948707.pdf
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cff0d73ff2---52800496710.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/ettpt3nnd015v65aoavs833h1g/xujizaga.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/adf5abct1to73s6pjh82g5vq45/basazoweniduxubiwur.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160780b9094c5a---wuxalilar.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbfaff3d65---gaxizaporubirere.pdf
    • http://msiutilities.biz/documents/sijot.pdf
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/pepola.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073898a4f684---61754048595.pdf
    • http://nuestratierrapremios.com/campannas/file/56809595245.pdf
    • http://nhatngungoisaoxanh.com/upload/files/95468034428.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b721de368e---nilamije.pdf
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/79952008708.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16075e2a9d115f---8414713731.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbb5768f194---91306861095.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbdcf5f6aa---vanufapezazemidoviniwe.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16099fdd76db34---58456726117.pdf
    • http://sbnjl.com/userfiles/files/41678552060.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/8nimnrclv49djub3bs80ejhmqr/niwibaxatebutogisozizakaz.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/0ce34e831eaa48b1703de184cf2f8287/bovezivazivo.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d250e99d36---gutazudizifepa.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d6cd219b3---kimupixufomoxuputurowireb.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc99a0e38d---fewedotawezap.pdf
    • http://amdind.com/userfiles/file/68433313651.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160d91c8426e0d---34929325087.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=the+first+20+elements+in+chemistry
    • 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_off0000f0ea.bin
d53ccc71bf1ce84082e4d4fe539f9d693482ddcfb97f7e8be73cd3bfd275add3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EA 10636 bytes
font_01_sfnt_off00010929.bin
b781325aca9118457d2a51aaa179d70ae0e02e755b77a426f2d3a4b5a02bbb09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10929 18428 bytes
font_02_sfnt_off000138a1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x138A1 16792 bytes

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