Malicious PDF — malware analysis report

Static analysis result for SHA-256 b147191ddf985709…

MALICIOUS

PDF

83.7 KB Created: 2021-09-20 13:04:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8dafef9a9a0c230c788bdf7b4c8896f8 SHA-1: 67a466f58c469e0c06b65d5575946892aabfd15c SHA-256: b147191ddf985709f3b4361e09d8e990b5f311aba738f6d802713537eeb8577a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, indicates a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://drafthe.ru/uplcv?utm_term=ninja%27s+creed+mod PDF link annotation
    • http://andreuma.madteam.net/ckfinder/userfiles/files/mupiligudopero.pdfIn PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/pejaxe.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/pibixosilonerarudowoja.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/45470799469.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/31a34cad1ae387b8dab30210e45c085f/devuzavagebunuwubenu.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/zufubakanesotanaxif.pdfIn PDF document text
    • http://hitmet.slektenkaas.com/bilder/file/xuvoruzegor.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/6q41lk1q1fhs4ih37mc7l6cjq4/80895786925.pdfIn PDF document text
    • http://stmarysharipad.com/userfiles/file/pebewofisur.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/17807337503.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/4069379463.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/gutadaf.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/32828215529.pdfIn PDF document text
    • https://bookmyexcellence.com/bookmyexcellence/js/ckfinder/userfiles/files/potenodunasamomaga.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/29292696014.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/kalapiz.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/s3sk5d0qith3sq5f9diqj4pvas/50049871009.pdfIn PDF document text
    • http://dfanchem.com/upload/files/96085314854.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/bewegukenizejepezivewed.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/19602664052.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/18204038346.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a015083ff8---mofepoluzotugal.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/48885623316.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/lulusipojefas.pdfIn PDF document text
    • http://devison-matras.com/upload/file/kanitivepo.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/bupoxuzomajejijenofagif.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_off0000e201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE201 18156 bytes
SHA-256: 7aef01f4d860abedc431300e771d9d427438cb92024d683cb6fd9b30393ed86a
font_01_sfnt_off000110fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110FB 10528 bytes
SHA-256: 30202b98c8000f0b122fe7b2388f2510b5c0aea1a4a966d56308b4cd73ebd6d1
font_02_sfnt_off000128e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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