Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaf07e367c510fa1…

MALICIOUS

PDF

82.4 KB Created: 2021-09-18 07:10:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 265b7b40bf1b682360d72644ba2128c3 SHA-1: 753eb429809ccfbd158a781ff84ad43a88550419 SHA-256: eaf07e367c510fa1e1120a3692a6d867bc69b04dfe1a0a7ef0acb706fd88bf4b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. Heuristics indicate it functions as a link farm, pointing to multiple compromised WordPress sites and disposable hosting domains. This suggests an attempt to phish users or redirect them to malicious sites, aligning with the ClamAV detection of Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dondepodemosir.com/userfiles/file/37375242247.pdf In PDF document text
    • http://mrcookie.tw/upload/editor/file/03051110514.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/ba348a2126a7030f9084d477a7f0d859/34109279879.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b8a5b2b44---88207877115.pdfIn PDF document text
    • https://typeone.com.my/ckfinder/userfiles/files/91890436218.pdfIn PDF document text
    • http://sake-tori.com/images/library/File/joborunigevobugomed.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/nuxewad.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/60144162698.pdfIn PDF document text
    • http://uslugi-ogrodnicze.pl/pliki/File/taxusasapijijinagusixuj.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/64294180557.pdfIn PDF document text
    • http://recepti.plovdivweek.com/js/ckfinder/userfiles/files/tinun.pdfIn PDF document text
    • http://majedalkarkhi.com/pics/file/685551736.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/gawivol.pdfIn PDF document text
    • http://www.reeder.ee/files/filemanager/42100411934.pdfIn PDF document text
    • http://photou.cc/ckfinder/userfiles/files/73591140183.pdfIn PDF document text
    • http://kiajihlava.cz/UserFiles/File/raxemaxifer.pdfIn PDF document text
    • http://old.smartplus.pl/ckfinder/userfiles/files/80127555075.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/4130eea1a7b6e07a7470312fa740d406/xawoxazujelur.pdfIn PDF document text
    • http://rts-3.ru/upload/files/vuviti.pdfIn PDF document text
    • https://ritascreation.com/userfiles/file/rozegopolepifaziruka.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/37653378682.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/99678545661.pdfIn PDF document text
    • https://aynispirit.nl/userfiles/file/77109107666.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/bujujawamipubalo.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/migajalokinefirupiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=what+is+sync+in+androidPDF 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_off0000de18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE18 10396 bytes
SHA-256: cb2e0e4dc443a2b838bdd58a42501fbda60b03a5907d651e676e23f8ac7413ac
font_01_sfnt_off0000f59b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59B 17712 bytes
SHA-256: dd899f09c6aa91a71958305d0e04a003e86dd929e6b8b04dc83d991d36bd3fbb
font_02_sfnt_off000123fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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