Malicious PDF — malware analysis report

Static analysis result for SHA-256 41f465cb77a141ac…

MALICIOUS

PDF

86.4 KB Created: 2021-07-14 10:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 743e48a27080e340c6734997d480bcf8 SHA-1: 2044f583006ae1fd8eef4d606d18e7b183cfff8d SHA-256: 41f465cb77a141ac9d928fbbdf810bb8058dbe088e0a76e8796c70f801282de5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to compromised CMS upload directories, indicating a link farm designed to host malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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 http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160897f796f48b---55808416246.pdf In PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d372914962---ranisanavigev.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609f8ed4af3d8---wufebovuludewozoxidew.pdfIn PDF document text
    • http://project-st.ru/userfiles/file/36324001477.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/85816490814.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/waxoxukikinirevuv.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/631e342d03f5a1d0d95b7c3f7c006b1c/tozivuzorage.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/gajideviwugikapukow.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/a85807ac7d41b761490eee86cf6c8926/503290068.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/62418404088.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/rqkua054kq099466055snrclr8/luzafojoxujodinekoga.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/af5aebdb533d07aef4b06b1f048db0b2/2886446377.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cdc3c6665---11072451330.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/botowogajij.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/37398073237.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/575b44894b145ec0aa9737de6121879f/didigilizamibelefix.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/medelosepefi.pdfIn PDF document text
    • http://i-dron.cz/data/file/terajuzujazuvakufejusemi.pdfIn PDF document text
    • http://thedreaminitiative.org/Content/Admin/uploads/files/kodijosis.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/46548929179.pdfIn PDF document text
    • https://4of100churchstreet.com/assets/media/files/fakebujakejejezukobavoxad.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9fdbe5783---geredi.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16076eb65469cd---mepowebaxibajane.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/22290398695.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e7a9ceabbea---gigositoti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=convert+html+to+pdf+with+javascriptPDF 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_off0000ea6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6A 18224 bytes
SHA-256: fbb56a26988e55279da400bfd748ffd9620d598ef63998bcee793f71868ded0d
font_01_sfnt_off00011a21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13238 11196 bytes
SHA-256: 84038bab474bb3606686835271cae943ae6fbb9ee120f1283e611b9c62c09386