Malicious PDF — malware analysis report

Static analysis result for SHA-256 04cb421327440db6…

MALICIOUS

PDF

89.2 KB Created: 2021-08-11 14:45:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 826f80f65297673d89fe6d87e6501ded SHA-1: b91e857252cd122abf900b6a6bbe2585738e76a8 SHA-256: 04cb421327440db686342490eac0e14120ea5b99cf99998e859ea402fc3850e3
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/4bqi6p72g3tft8ak0tb8gjm0u5/gudofapagipuzazo.pdf In PDF document text
    • http://aloeverajuice.cz/files/file/59791827081.pdfIn PDF document text
    • http://wujipacking.tw/upload/files/41202231577.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608598b511be7---6118293108.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/57473233e56a919b6fb3e9f8d5096c4b/vimegarajabumiximas.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/ptjtl3pmas10q2tfcv89c01p27/31483500684.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/diwibiz.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160a64c81eb81d---64208711468.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16219977982034.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607b998168454---95998337291.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4de1fb9a18---gitojomatezawaxepusupi.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2adac3b783---20671914973.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097c7e8487aa---vunufonadijokofipomitoj.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/fgt7b4ovnkhhen3bqoknhcov55/metarokeguvujudodow.pdfIn PDF document text
    • http://marty-triple-m.ch/inhalt/files/50616632064.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/galobifegemozigizotix.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/5c44c85e352c3a52327b29b9f0e3c951/93174373891.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b4340c17379---95595152741.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/nemebutilolidoguvonikomur.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/a11d0cc591fb4a33fdf23d1b7adb0813/wexojomadesujamegikugex.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/buzuwixefifuz.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/9618263642.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=what+movie+is+upper+decker+fromPDF 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_off0000f677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF677 17740 bytes
SHA-256: e3fcba94110738b6eaa1041bdfc723e2c6d1ddd862e4b0dd925cebd35c0650d0
font_01_sfnt_off00012480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12480 10984 bytes
SHA-256: 2257de68c811d728b4791898ffeb7a949f9343d5443fcbdc9c395bb667818a5b
font_02_sfnt_off00013e19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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