Malicious PDF — malware analysis report

Static analysis result for SHA-256 a377f134f01c648d…

MALICIOUS

PDF

83.6 KB Created: 2021-09-17 07:20:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e2928ec35b641c7d65048eb931971488 SHA-1: a5a839d0f442de69450ecceb452922a1418bdead SHA-256: a377f134f01c648df27daa7d57cd520aba98411750cd76286202dbd27d732bbc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection for phishing and trojan activity. The document functions as a link farm, directing users to numerous external websites, some of which are hosted on compromised CMS uploads. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to obscure the final malicious destination through a chain of redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://bjjewels.net/nbloom/fckuploads/file/96464721179.pdf In PDF document text
    • https://vanphongphampmc.com/upload/files/88220974944.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/3fd5dca4689fddfb9a49ede3883ff671/62818885882.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/mbfp5cl9nl8iu3il4r1vf0h7fq/fesozato.pdfIn PDF document text
    • http://paliukenas.lt/i/File/zarom.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9882cc308---18204982729.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210902_F4745BD431B6046E.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/newepubujilonasavebate.pdfIn PDF document text
    • http://interiorsexpress.biz/dayafter/uploadimages/newsimages/file/xukudovikokozumekubevi.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/jojepiwadigot.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/66256614301.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/gulid.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/fuzepijevotevuvex.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/3d667dfd0528e83955e7d9379f4d7c97/61858230560.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16138d491790c4---179340687.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/49813115972.pdfIn PDF document text
    • http://ariogalospspc.lt/userfiles/file/manivabuwelobexun.pdfIn PDF document text
    • https://elemonbg.com/Files/File/lunawokudinuse.pdfIn PDF document text
    • https://lomasdelaweb.com/userfiles/2008.09/file/litesoxilunesifodudike.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/88155879009.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/tafopafagamilokusamama.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/52773559577.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210908/files/20210908102851.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=shadow+fight+2+all+weapons+apkPDF 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_off0000e233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE233 11048 bytes
SHA-256: 371c60e88722f293e503f3e922cd2ad2b1971f55c5051de82b03c71563024143
font_01_sfnt_off0000fbc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DA 17456 bytes
SHA-256: 6a8effc1d5d02ae5443d47d8f140cd48a4e9764961f07187e227d5f6ae60812e

Open this report in the interactive analyzer, or submit your own file for analysis.