Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeecb10f41fc50bf…

MALICIOUS

PDF

73.8 KB Created: 2021-09-01 14:19:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 31dd3e34521090bead76413f43d98b6f SHA-1: 52ee5669b73529c083013f3f899a660fafb501ce SHA-256: aeecb10f41fc50bfcff4ce666a989aa958f96cff9508a6a989194affb33b1777
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. The embedded JavaScript likely facilitates the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=the+fault+in+our+stars+remake PDF link annotation
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/4ddfe9828b83937cb730d3b5015be6c2/81371313661.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/basanojokefuzusuzo.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8e723277d---49787609397.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/loseb.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/42359884053.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e104e49cf---787096167.pdfIn PDF document text
    • http://iqlacpro.vn/emotive/upload/files/31655116858.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/witejojeweg.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/61331844044.pdfIn PDF document text
    • http://teresachild.com/upload/files/norusewegasotusatusujef.pdfIn PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/85780112522.pdfIn PDF document text
    • https://mfdesign.hu/files/file/87430541927.pdfIn PDF document text
    • http://colescastle.com/clients/875019/File/kigeroduditunixa.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/bugusezafi.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/7474360426.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog/file/kilolegakixek.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/jemelimalogema.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1610e33f0dc802---marepewazasefuso.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbd057f359---6414291258.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb0054097c.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1aea6bc055---dafuvegaxuwerifivujiv.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8e712ab67---79185503512.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/a59ba2a9eb1a27e986802f31ff971404/94642340834.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/vubikawamudagemegupoj.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/55155432940.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/wimewekimanexagatexi.pdfIn PDF document text
    • http://mrbossamktown.com/uploads/files/ladanajirogezuzerunizu.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_off0000be73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE73 16680 bytes
SHA-256: 528abaf0b6c11215c7ea60feef9fa62bf9a1bc875d5bff4d7b30eb093d241ac3
font_01_sfnt_off0000e917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE917 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001012e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012E 10632 bytes
SHA-256: 5d2dfeaecbdd50bc279f0a2fae7ac92abe02765f1be736250327382d9b8da1dc

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