Malicious PDF — malware analysis report

Static analysis result for SHA-256 486ddb856cea8ed1…

MALICIOUS

PDF

86.2 KB Created: 2021-10-08 23:17:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 41114783cf777a96dae0476aba501757 SHA-1: b713fa0acf57b52a3d02c404d9534d2152e61d77 SHA-256: 486ddb856cea8ed1ec0c7f0bcc6e518a6d411ea82ad1192956daa492b5b62c23
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to compromised websites, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, and heuristics identified it as a link farm on disposable hosting, likely intended for phishing or malware distribution. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9762

Heuristics 5

  • 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://huntic.ru/uplcv?utm_term=dispatch+bengali+meaning PDF link annotation
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/i2jsdgampie1t9mohg1mu21tbu/gugejaxazuxo.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/f9aqe3iafr0hsj4ev09a3qf9s6/31627437322.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/84536896740.pdfIn PDF document text
    • https://belretail.by/ckfinder/userfiles/files/japutisazamev.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614a36efa0984---bokelisokotan.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1614898a2d5cad---gigoselukekibasozujejut.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/levejepiwewajurel.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/damokumupe.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/14529121469.pdfIn PDF document text
    • https://izometal.net/mm/file/12377055543.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/76243826353.pdfIn PDF document text
    • https://proxkimya.com/resimler/files/komozimowukaliwo.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/gasasere.pdfIn PDF document text
    • https://kitchensofdiablo.com/upload/file/66926494119.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/vuwojasaremakodarizi.pdfIn PDF document text
    • https://keluargamimpi2.com/contents/files/87983490162.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/pubnpegu7p13orb2rd81pue8uh/xujeladawapuxarawivupu.pdfIn PDF document text
    • http://vatlieubaooncachnhiet.com/userfiles/file/rosef.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/18991601873.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/b49ed8d671de44dcb943d64cb6a851a8/81355990497.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/2e26677c3046727bb51633a53ec039a5/povezolu.pdfIn PDF document text
    • https://promptcorporate.com/ckeditor/ckfinder/userfiles/files/ropezedokajufok.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/vudir.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/zivuzerenevusax.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/1d8f92e4a8d9beaa8fb859cec95dc1ad/15035364470.pdfIn PDF document text
    • http://a-pluset.com/userfiles/24480602373.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/60798505695.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/sumivesivorifa.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA54 10744 bytes
SHA-256: f91738441fa46384af9ee7711cc7da7015392de3b4c0d2ca3ab10bb60f90673b
font_01_sfnt_off0000e2a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fabb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABB 22444 bytes
SHA-256: 7fa5e6728d872d0b0e826f769af7b9071d23e1712d176f12054ba928502afb37
font_03_sfnt_off0001346f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1346F 16232 bytes
SHA-256: e06ebeaa2bb94d9bf14337b0794fec2c9c4a66e30291689b6f6234bfe360c8a5

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