Malicious PDF — malware analysis report

Static analysis result for SHA-256 aac99162a6694482…

MALICIOUS

PDF

73.3 KB Created: 2021-09-24 21:44:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3d8d3d29515acb6c30ca728d8ccdc2b0 SHA-1: 7944ce31812c399c9cf12f8adb34b3be21e64fad SHA-256: aac99162a6694482bb9bf34215ca6298a6a3ad2c5f4e63cf723440e677ddc4a5
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://synerhu.ru/uplcv?utm_term=pokemon+mega+emerald+version PDF link annotation
    • https://abrasco.org.br/ckfinder/userfiles/files/muwez.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/sasagamimudaboxatozukok.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/8473934212.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1b1fbc2a1---78999801538.pdfIn PDF document text
    • https://berettyobne.hu/userfiles/file/jidixima.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/fixawarotizijugafetodi.pdfIn PDF document text
    • http://carbonelite.ru/file/rororuvok.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/43017871284.pdfIn PDF document text
    • http://3mfa.com/images/editor/files/8283509179.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/16812838938.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/qj7svf63kvi634c0e9jfo0n6m7/dixupasudanejonadoxatavu.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/18812637972.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/69376341986.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4574118123.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/e9re79d51gl96n98h7cki1ob47/21726892514.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/kekawekosodo.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/xiwejepugug.pdfIn PDF document text
    • http://biafrapol.pl/pliki/file/96892998922.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/kopaluwupizula.pdfIn PDF document text
    • http://rigosarchitects.gr/userfiles/file/34039772364.pdfIn PDF document text
    • http://e1pl2.nazwa.pl/busy/fotki/file/falef.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_off0000b2fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2FA 20324 bytes
SHA-256: 37ad09f50253479596b7be63c140fe2c923192436be9f608357b464121267ffb
font_01_sfnt_off0000e77b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF92 10652 bytes
SHA-256: 0bd5497b788fd90bdb07cbc05b08d1b308718e32f94225316ae7ecce14ac6745