Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd92cc7dd8629565…

MALICIOUS

PDF

75.7 KB Created: 2021-09-14 08:45:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0b180f5c0f5299de7761cd7046fa48d9 SHA-1: 14d8e3b58a2580aad539ec844ac773cbe6d55d8b SHA-256: dd92cc7dd862956552ebb83132a024f1ba61c5f8327a2767f01d90bdefc3188c
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristic analysis revealed that the document functions as a link farm, directing users to multiple external websites, some hosted on potentially compromised or disposable domains. These links are likely used for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://smidgel.ru/uplcv?utm_term=live+football+streaming+apk+ios PDF link annotation
    • http://bradzo-ep.com/uploads/files/10576484198.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/lanelajoxifabodivokobob.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210905171915.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/rixuwagabogi.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/vitoniloximumozes.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/pasibit.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/27121228347.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210910_151715.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/4d4mu5nr1ttq11g9crtjsht73d/80783239672.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/xironijoxilewukoji.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ac5c59592---fejerifigowejevasopobot.pdfIn PDF document text
    • https://khonggiansangtao.com/platformecom/img/upload/file/36658148830.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/keduwanitorageduw.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/20157956528.pdfIn PDF document text
    • http://888spirits.com/userfiles/file/88413393856.pdfIn PDF document text
    • https://nusamulticentralestari.com/Uploads/userfiles/files/22410122222.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/75726890949.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/kiwebewosura.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/sogebunorev.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/fedekax.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/0gamgon2s9mbqn4u641kfeltbj/73182790210.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/latesozepuzirodutigolatoj.pdfIn PDF document text
    • https://szallas-karpatalja.net/upload/15235288592.pdfIn PDF document text
    • https://vr-spagna-20.effievirtual.com/galeria/files/33455519041.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210903140101_1850974164.pdfIn PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/71903550193.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_off0000c190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC190 17368 bytes
SHA-256: 5de1e927e4e969d52806358796864a0a7c9c517d4cae3409fb2a3ded47abaa72
font_01_sfnt_off0000eeeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10702 10956 bytes
SHA-256: 6ee70c35911c6d07590e4f3d72dda30cfc696ad072350e36691a28b04d069449