Malicious PDF — malware analysis report

Static analysis result for SHA-256 b912eb901a27ccfe…

MALICIOUS

PDF

83.1 KB Created: 2021-09-18 19:13:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 445c3b19ee5acc35a73222da2ce9d4c3 SHA-1: 94490d79eeb4da015daf9408615efa92b5ea1d41 SHA-256: b912eb901a27ccfe59dc10f3c05871dca0448d0aba707b16e065af193931f1fa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to exploit PDF vulnerabilities or perform malicious actions within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coretry.ru/uplcv?utm_term=skam+season+3+full+episodes PDF link annotation
    • https://vivekanandbawwa.com/userfiles/file/gowibefe.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/82649301869.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/3501030350.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/73594475007.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316b2492f2b---37097027361.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/fetaxivitiw.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/97719323208.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021091620104873499.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/9492421794.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/6445527435.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161423e7c4fb3f---zezudiju.pdfIn PDF document text
    • http://freeorden.com/media/file/sekesipupowosidirerome.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/1887163920.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/5268615073.pdfIn PDF document text
    • http://guclupin.com/calisma2/files/uploads/gidunotomimodoxexomigumi.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/69190610306.pdfIn PDF document text
    • http://cutskytools.com/d/files/53274564906.pdfIn PDF document text
    • http://roberthalasz.eu/uploads/file/29759495790.pdfIn PDF document text
    • https://oriontradecom.com/ckfinder/userfiles/files/nibopopumifumewitatoruvu.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/36325868959.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/92843513408.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/38992988073.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/e78cb7542f433467d89c21da48010285/mikekawefiji.pdfIn PDF document text
    • https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/66649679364.pdfIn PDF document text
    • 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_off0000dd50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD50 10900 bytes
SHA-256: a34d16e76e79ca4867a107fcb14bb6d5f8f85d6fcc3a08a17dd531d73fd36caa
font_01_sfnt_off0000f676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF676 18656 bytes
SHA-256: 788213923afca0a2f5e5d8344a2bbd5e9f285ced3f653bcb57a282691afd465d
font_02_sfnt_off00012688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12688 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1