Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdd64987b5a4ae5c…

MALICIOUS

PDF

78.2 KB Created: 2021-09-08 10:26:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 600dfdfa5bf9c7cccff5ef9bc5adfe87 SHA-1: 2642a09a6af0a34cc06779251d5e028697188e4b SHA-256: bdd64987b5a4ae5cef4c84b72916f8bbfb59245420c5e7d605f31e5e0bfb923c
156 Risk Score

Malware Insights

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

The PDF file contains numerous external URIs and links to compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://queure.ru/uplcv?utm_term=fisher+price+monkey+jumperoo+manual PDF link annotation
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b284c8377f6---losinuwiwobezu.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/57206101240.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/ac44c149740dfdd9a2291f0995031457/30954051371.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/tifekop.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/56963810290.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d67c423f16f32e7df0ee6136aa377f61/99595366728.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16084e9892579c---fobuxukarakavagupojukara.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/naxagim.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160a310704e8dd---22463679952.pdfIn PDF document text
    • https://fcr-fomentoconsumoerenda.com/uploads/files/defidakowalavebobot.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/patatiwoxolobarugemigegi.pdfIn PDF document text
    • http://komodovo.ru/upload_picture/58989747611.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/a5552471bc2cca6501ee1a941d1e19dd/nataganeladifoxabu.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/r5tj5vci4qkqhhni05jtcj0tjk/rebokelepiloj.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/nijosabuxo.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/relupojutenob.pdfIn PDF document text
    • https://tomas-music.com/contents/files/zoxime.pdfIn PDF document text
    • http://bedrucken24.de/userfiles/file/87469134717.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c49fb992ccc---zedikekulilugalivo.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/c694b4e1516e17888495a41356f0abc8/wolovanubu.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/65063822520.pdfIn PDF document text
    • http://mingzhicc.com/userfiles/files/47743901825.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/xoziwamusegapaz.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/56352582449.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_off0000cb9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B0 17356 bytes
SHA-256: 23a98e014d99702d8c279ef1542c79f11c789370b84ce2d5ad93a151cb7794bd
font_02_sfnt_off000110a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A2 10952 bytes
SHA-256: 6efecdc2b15aef153f65e33ee4d28edec435a8da526f93b76f5a29203c20686c

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