Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbe4d2df8d267399…

MALICIOUS

PDF

113.0 KB Created: 2021-07-18 06:35:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 10f53095591bf606e27ef77760411140 SHA-1: 4cb5b23d218c731f9a32e3366c4c195706ecf440 SHA-256: bbe4d2df8d2673998bf0bbb1375f3f8e1d5cee17a30334cd5a5cf059a9bbdb42
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a secondary payload or phish users. The presence of multiple compromised WordPress upload links and disposable hosting suggests an attempt to evade detection and analysis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160edfb721b747---resojisonarifubukawimadi.pdf In PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a673f4a5c18---32552326923.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/lokar.pdfIn PDF document text
    • http://df-2.de/images/daten/file/89008737931.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5e75d366e---30791922359.pdfIn PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/93638057283.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/1726d8c47001931b7c1a4751ab784887/dinunutikozodo.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/befukom.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/ufo6gjbc302hou1rcp1kkfkiq4/148077908.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/pamamisanuturidupo.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/15295789843.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/gsdnn4knsqvqq0ahk58n9fibh3/74895155652.pdfIn PDF document text
    • https://asiajitutop.com/contents//files/57988100454.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-06-09/images/files/92037512772.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/51783624400.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/uxujirovovimepaja.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/bf30809d4f32ee58981a3e410d693998/74251338365.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/pakilit.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/b097fcdde54284867df5ce3dc96b7622/97356772086.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/nexixebase.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/72a7a566408ebbb8698cac603a5de2ac/lerijoruregivebonanujel.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070bdf5be347---21060430602.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/81027019702.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a4cd84c000c921eed1bca4e01533af0d/3005055800.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=a+bronsted+lowry+acid+is+a+substance+whichPDF 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_off00014f0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001671f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1671F 19768 bytes
SHA-256: 75fe67c4e4ff06c0141a702c605596c54c4d9d6558c2299d64f7af39bac888b8
font_02_sfnt_off00019bdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19BDB 10888 bytes
SHA-256: 07085761023d998277fc71cfaf36c3f7a972e3f85cd59bf6de8c21dba7498eba