Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fb5a246a05433cf…

MALICIOUS

PDF

86.3 KB Created: 2021-08-09 03:05:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 539920492c61378d66a6b96f94bf8d47 SHA-1: 50c64a03110c42ec730f1315ca68ea0d972dad74 SHA-256: 6fb5a246a05433cf9430afadb31710dbc72fbbbb7218ca8dd38175c848be269e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/3052632f69185f4c73c1bc06a96fdb53/molukonasujolegudokaw.pdf In PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/90d9cc263a2b7b3a608a38be56fcd95c/wetarutoxalajigokirubo.pdfIn PDF document text
    • https://penal-garazh.ru/files/giseromuwamokotawisufalal.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e017c9d58---56636412134.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/2463482115.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/vabowibelexunapusa.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/843224835.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210721_6BB4AA819FEC5F7B.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e327ea8af---36212536476.pdfIn PDF document text
    • https://digireg.dk/upload/96928969372.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835edab479f---vanoxologidapiletuboki.pdfIn PDF document text
    • http://granitemountainranch.net/userimages/tojoxamibunogupuzoritemu.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/nodunudizogovufigapek.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3ce021b32---tifot.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/dbbljpi6qdrd9mi00stb9ris8u/joxufokuzenikesimikugo.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ef3850866---282747441.pdfIn PDF document text
    • http://calebdobe.com/clients/875189/File/82686652059.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/2494887645.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf2df61934---delimox.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/vuvilejobapebidabawamej.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/64aga5rqg8pk69etbuekkrmkn1/favajimur.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/7424735904.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/pk1b6bnro00jahe5akuraea01h/xuguxaju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=dragon+ball+super+mugen+2018+download+androidPDF 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_off0000e932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE932 11468 bytes
SHA-256: 6cfc8b7178496d89e7066435373929913c899a05ae1f40d8a2f942e735c8362a
font_01_sfnt_off000103f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F0 18920 bytes
SHA-256: 0a63338b0d1ae70983d221bc70b8615358623b54173b37b81a850030a22cf98c
font_02_sfnt_off0001331a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1331A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1