Malicious PDF — malware analysis report

Static analysis result for SHA-256 75d891c9f24f9ef5…

MALICIOUS

PDF

85.0 KB Created: 2021-07-02 00:11:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d19b00cb83fb1bfea230edfc2ca30ee9 SHA-1: 6c9255a330a307cad78cb0fc3593be7fb8066361 SHA-256: 75d891c9f24f9ef59f0e711e23670c86a14755642eccd0d7b0d7b6252b091caf
156 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics as a link farm and a potential phishing or malware distribution vector. It contains numerous links pointing to compromised websites, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://aulacvn.com/upload/fck/file/gazepakusaviliradakab.pdf
    • https://maisonforville.be/documents/file/28677765675.pdf
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/1aca1b402db3826e4b7ddbfa41d968bf/kejatapo.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aabb8df03b1---8930967496.pdf
    • http://berallebags.com/UploadFiles/FCKeditor/20210606001305.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/9b75d6cfe724c1ffc0ff4265cb36eb43/tipatasagokada.pdf
    • https://cottingham-group.com/cufiles/files/21161148955.pdf
    • http://clinicaveterinariacene.com/userfiles/files/81636618240.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f862a77af5---13117918610.pdf
    • http://mosjob.ru/images/file/65229584684.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d073eb580bb---niworovowoberilupulu.pdf
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/404de41358fdc401b73978a629b8f67d/sifumibunuxo.pdf
    • https://abeess.com/userfiles/file/gukurelagusiturebufop.pdf
    • https://bustotoronto.com/userfiles/file/famifizefametuvuli.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/bq88h25bmr50hfflg920s7gjg0/foronusadixepezuburijo.pdf
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/febe05c44106434de627bbc4148083c0/gujutakepiwivinujorasej.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8fad730e7---kapeludirixuwufutip.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/52082baec117a2654f9a1d31cefdd2e8/lanegunuxotarazanidu.pdf
    • https://www.indoorclub-informa.com/boletines/img/file/36887689561.pdf
    • http://kaushalacademy.org/ckfinder/userfiles/files/90578736366.pdf
    • http://apsons.eu/files/file/55519870950.pdf
    • http://ducthoaudio.com/upload/files/bereminuvevijobavawuxefov.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab30ebb2d7---vakukitukiwuresovozapivu.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a61021f2b40---porogopiwoven.pdf
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/5gm0k1gc383vnpe9t6i4ljk5dt/fajogagiz.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=basal+cell+meaning
    • http://janyska.home.pl/_mjanyska2013/fotki/file/25943529919.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_off0000eaaf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAF 16792 bytes
font_01_sfnt_off000102c1.bin
47e71ed0e079d64b290c7b5fbb25fcd7b3d4ff7bf3079e914307e9251e9226ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x102C1 17356 bytes
font_02_sfnt_off00012fcc.bin
6bb7f79eed9a5a6c3b75b6ad894493b7638d3b1eec14232f1afe16321e7fcf6c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FCC 10308 bytes