Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc32c55d3955249c…

MALICIOUS

PDF

82.7 KB Created: 2021-09-05 18:42:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: aed92448dc122d861f444f182c03baa4 SHA-1: 3e37ea07c3e83c2f4ac26f5c84cd169e0daf3500 SHA-256: dc32c55d3955249c6fa008ab52e00189269988f75eb00753faf92de127230eb0
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm hosted on compromised WordPress sites, as indicated by multiple heuristics. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the structure and URL patterns suggest it's designed to redirect users to potentially harmful content, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897817b941b---momusokuberajigajepemu.pdf In PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f9596c974---2469460450.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/kabenawelemuwiweki.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/vesideveranenademuwebo.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210818230247.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/0ookml6jm8oilh69c2s0c7gaek/fiveli.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/3818fa384c91cbdca6b6790db0bc4740/dijefiva.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b91dec56ab---somudugisomasar.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fabf17084ba---pagawiwopapugajusuvogame.pdfIn PDF document text
    • https://kede.org/userfiles/file/61523062351.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ph329a2n4k9h6sas2vkf4ml3o0/2340390518.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798a54cb811---jisubonorikivavubik.pdfIn PDF document text
    • https://mar3ol.com/Files/files/kevaxofov.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/livovuvomimu.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/zomopapudekuxaxekuliwe.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/kanejizajogo.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607524d66a8ce---lebitod.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/vixoroxo.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/jaguvugulefokimolusaxu.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/77316861022.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e22391111---pamuxugipakejuvi.pdfIn PDF document text
    • http://juncheng.tw/upload/files/lasasogebagivijulefapodam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=referred+pain+chart+pdfPDF 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_off0000e186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE186 10428 bytes
SHA-256: 7e3a27c257c216d4136ccd96893461ee70b1cc59b05dd61b15abfd9e587c25f0
font_01_sfnt_off0000f90d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001111f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1111F 17324 bytes
SHA-256: 27587130fda09187698e6e0873eb3ede63cc5c4be05b6859cbbdbd1cd9df15b8