Malicious PDF — malware analysis report

Static analysis result for SHA-256 b97b0d08a2fbed59…

MALICIOUS

PDF

76.3 KB Created: 2021-09-19 19:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b5cacb47552116352124ac68c483d681 SHA-1: 3bf6023c5cfaa4e85a1c494ae963d73bba17a10c SHA-256: b97b0d08a2fbed59d00fa7c6f43197478160de88d49a2bfb121571b7d2232f9d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains a link farm pointing to numerous domains, several of which are hosted on compromised CMS upload storage or disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the structure and URL patterns are consistent with a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://generaltubi.com/container/ckfiles/files/batozotusuzowavovi.pdf In PDF document text
    • http://unitekinfostructures.com/userfiles/file/52645679001.pdfIn PDF document text
    • https://konchris.com/userfiles/file/1630861209.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/masedigidavitukab.pdfIn PDF document text
    • http://www.bandungmesin.com/file/dinoxakivimifef.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/rokepuxilorububawa.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/vilisunu.pdfIn PDF document text
    • https://hawkseyetravels.com/assets/ckfinder/userfiles/files/21800803392.pdfIn PDF document text
    • http://ttc-investco.com/img/files/81500981640.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/33863313552.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16143d5482de53---deperomofinowofufegubi.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/99096486525.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/guzogilenixo.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/5e3934618213f5deac08e7fac63ab6fe/xifetebepoximutegijarivil.pdfIn PDF document text
    • http://silarperu.com/UserFiles/file/68050341231.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/68858537351.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/mijukunesozoperemesezod.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/50810868810.pdfIn PDF document text
    • https://fond.ru/userfiles/file/fanixewut.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146ac3fc60c5---58713828200.pdfIn PDF document text
    • http://highlevel.pl/userfiles/file/lenivasumexidiza.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/m4n7gjbl9hb1aqivaldu70hdme/94461189762.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/jexamenilodovinuxovan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=can+t+play+youtube+videos+on+android+phonePDF 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_off0000c78c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC78C 16568 bytes
SHA-256: d22f1bc00b9ee75dac0446f942961f7ec9b961e25912899517c00b1259cf9b59
font_01_sfnt_off0000f21f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21F 10940 bytes
SHA-256: 388c40e61ef1d18e1e3425c7e9bd4768baf1f6993ee9a5ee42193cf26fcee1e4
font_02_sfnt_off00010b3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1