Malicious PDF — malware analysis report

Static analysis result for SHA-256 707b84fdd30ee78e…

MALICIOUS

PDF

77.7 KB Created: 2021-09-12 09:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a69c0b25f8f78e8996452c028efae4d6 SHA-1: 38bacd2d3b9ad90ed17a2316bc8da79a14c7f17f SHA-256: 707b84fdd30ee78e5327384809a64860b0293321b3d404988e2a0e4bd412440b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to deliver second-stage payloads or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://oniceh.ru/uplcv?utm_term=instax+mini+mod+apk PDF link annotation
    • http://skolicka.eu/foto/images/file/tatugikugerami.pdfIn PDF document text
    • https://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/rizoluke.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/55406990291.pdfIn PDF document text
    • http://indemo.pl/Image/files/talatodi.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/r95q406n14hmid3opmqd8nv5q3/83095540535.pdfIn PDF document text
    • http://gimhaejazz.com/fckeditor/userfiles/image/43163646940.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/52983403358.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/junor.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d160ea0f71---gulofelosakesidimirofez.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/38672538396.pdfIn PDF document text
    • http://goodlife88.com/uploads/files/71089165595.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/3019084186.pdfIn PDF document text
    • https://adetexfoamgroup.centralcms.cloud/galeria/files/98821216737.pdfIn PDF document text
    • https://mallorcaboom.com/res/wysiwyg/file/2574892677.pdfIn PDF document text
    • http://greensketch.in/userfiles/file/1805797296.pdfIn PDF document text
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/dinegavawizelopotekitar.pdfIn PDF document text
    • https://mauspro.net/upload/files/37000499693.pdfIn PDF document text
    • http://unitez.net/images/newtech/files/wesolewo.pdfIn PDF document text
    • http://fitviewer.com/files/file/kovisebijuzuxiwu.pdfIn PDF document text
    • https://labelmarket.pl/data/file/10323675057.pdfIn PDF document text
    • http://0985028898.kad.tw/kads/ckfinder/userfiles/files/40715625623.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/disenenaripi.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/98075240201.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202109092205214131.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/juzapir.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/069e4f6d590b375ebfaa267b0df416e8/83973697574.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_off0000ca13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA13 17972 bytes
SHA-256: 9f1b5214fd09ac1e0d4d42b3cabfc4863e4ce4dfaac2af12af19cbaef4931533
font_01_sfnt_off0000f8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F0 10420 bytes
SHA-256: f47fb8ed74c479b5c7835e1c9708ccef751d1f0bb200c52d4347847777c4a587
font_02_sfnt_off00011089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11089 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1