Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e06b2ce0907ea76…

MALICIOUS

PDF

77.1 KB Created: 2021-09-19 08:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6c737b269c73d47e0b9581eb91ba9621 SHA-1: 1531ae32bf88b4068e7659a86c7166c5a5c8071e SHA-256: 1e06b2ce0907ea7698569be9d02b5d57d8f685d675b4ee71d5d4cd5e11ac9347
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to various domains, including those hosted on compromised WordPress sites. The presence of these links suggests an attempt to redirect users to malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://pistant.ru/uplcv?utm_term=best+ide+android PDF link annotation
    • http://t-p-fortune.com/userfiles/file/39570833493.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/41775970040.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613443a9c61f4---72064038853.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/24079590983.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca8a91c2e3---rixaduruvufowivunenuk.pdfIn PDF document text
    • http://mcdanielz.eu/files/file/mevubaxagosunediveb.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/89446320626.pdfIn PDF document text
    • http://bjsddesign.com/filespath/files/20210908204924.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/1610001283.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210903192333595.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210905184907.pdfIn PDF document text
    • http://thoitranglani.com/upload/files/fegodasasabojijege.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/sewokenegafa.pdfIn PDF document text
    • http://ppogrimall.com/upload/editor_image/file/javujuxunamojise.pdfIn PDF document text
    • http://nbc.ua/design/pic/file/mofamivodubaba.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/60b4554d2a718a95a14d430235beb98f/13437788788.pdfIn PDF document text
    • https://duocvinhkim.com/userfiles/file/kulokoliwobo.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161436e3c0df5d---mukuparopese.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-4/20210904184856215108.pdfIn PDF document text
    • http://www.bandungmesin.com/file/pilakuveruk.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/65885352537.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/77855234132.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_off0000c9b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B9 10248 bytes
SHA-256: 7c3886a9197593181221ab70e56203258aa9a5a28ca265b750fe96520a8688a7
font_01_sfnt_off0000e0e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E2 17800 bytes
SHA-256: 84e62d3fbb664304d802b8e657b8bdbe6aee202dcdf17073a18073d40b2e779f
font_02_sfnt_off00010f0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1