Malicious PDF — malware analysis report

Static analysis result for SHA-256 e759a985a86757ca…

MALICIOUS

PDF

85.9 KB Created: 2021-08-03 16:28:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7b60dea3b46ad05b3c0a42036fa64154 SHA-1: df156313282bc853b38df6cb503f882c898e48a7 SHA-256: e759a985a86757ca37f15c03b5b8e36e9def60ee3249b0c0df8f0c58965e96ce
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and other potentially malicious sites. The primary purpose appears to be directing users to external, untrusted content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075008146a93---susigifefegadevu.pdf In PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b415a19fbd---27000798638.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/pagetituw.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/6938089884.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/fj267s74vhrinf4mj8j693gb2q/56074163739.pdfIn PDF document text
    • http://nbpcpentecostalchurch.com/clients/65183/File/45265579771.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/xititedu.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/lixizopetoxaxegetutodader.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/mefajibewumipoj.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/jarenat.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/lejurusizegi.pdfIn PDF document text
    • https://soechi.com/userfiles/file/naboxaxazewur.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/jorixamonurosexogefuv.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/nebaxaseluxa.pdfIn PDF document text
    • https://dm288.com/slicice/file/gisurilitulikumi.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca85c13757---lawojizasopazal.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/wikitixumisor.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3ff76574a---mufufezagabetenowebe.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c50d07480ea---nanosororiroruwenojax.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/07/files/210721095632.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=ihome+keyboard+instructionsPDF 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_off0000e909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE909 17532 bytes
SHA-256: 79fe0be71ab0d90c73869050a523ed538a030cb0ed1892a1482058221a3e4ebf
font_01_sfnt_off000116c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012eda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EDA 10984 bytes
SHA-256: 409b47d48e1aea48a8e925def09de84ee06376a37d8b8b351b5e51e1fe04569f