Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0e40676d87a7fef…

MALICIOUS

PDF

105.0 KB Created: 2021-06-27 07:51:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cb43b5b3d708527e279fb9fc629391c1 SHA-1: 9b958afa63c2e4b4f79f9b9d54cf5ae484854506 SHA-256: d0e40676d87a7fef9cb77231a61aeddbabf0e2d51de9520af749203b7f28edcc
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://oniceh.ru/uplcv?utm_term=que+significa+possessive+adjectives
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/nplsukt2p4530cffd5d1a5ame5/vurefagamuvujaxobegatan.pdf
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/23cc4cf3850f89d289734de18eb579f0/42799601371.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/fkenr3jptgdqvbaq595t0t2n30/35550855711.pdf
    • http://albatrossmrn.com/konadnew/userfiles/file/ladexajexefizanor.pdf
    • http://ampletrekking.com/userfiles/file/58295545386.pdf
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/35218845930.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4e40c873d---10470699505.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb3bfddafd---kuxofopudenulekujikewa.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d1b879071---77870883688.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efeccab0de---kanitazaz.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/84253e52aef141fd4b042c6ab036392e/63437969620.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608146efd450e---60209218818.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828559f2ad4---99472966852.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/eknd7oo8ppmqu87agrstj0u0f4/70423052147.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/1d86d69145672f250c9f879ef1406df4/fuwabezesijamutasomikeru.pdf
    • https://wineart.online/userfiles/file/zilixofetunujigefufoj.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a5dab92672c---taridixuzud.pdf
    • http://iuf.kr/pds_down/files/19216892106.pdf
    • https://braindevelopmentmaps.org/userfiles/files/xopazisojomapejimi.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/0cafea54b195535632d575ff68584c31/jigajezabogeliliku.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/tdoco5bii8e8umnndedhsfibv2/7925754464.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/ca66f99d94643903e4bd0677ee3c48a0/60896632824.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/93e84477d28a93bc52cd41134f33b010/koxulosotot.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_off00012ecd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12ECD 16792 bytes
font_01_sfnt_off000146e4.bin
bf6916265a3c886ca4b05765087aca0b92677c5f2658a69f2e11433668941d6a
pdf-font-stream PDF embedded font (sfnt) at offset 0x146E4 11004 bytes
font_02_sfnt_off00016084.bin
f01f8857d59431bf1f4e2c72feecf207572c465d6ba20e48bada4fbdfdce53d2
pdf-font-stream PDF embedded font (sfnt) at offset 0x16084 21064 bytes