Malicious PDF — malware analysis report

Static analysis result for SHA-256 2797be4a246077c5…

MALICIOUS

PDF

76.4 KB Created: 2021-09-17 17:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 621170f7ed3fa3976a674176d25c3e4c SHA-1: 47b99ff1bc39e14ab52e49aa574dd08a47d188e9 SHA-256: 2797be4a246077c52ae9611054b4922d435acc011fa8f6dd2f09889f0e2b44bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Analysis revealed it functions as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting. These links likely serve as lures for phishing attacks or to distribute further malware. The document body was unreadable, but the heuristic findings strongly indicate a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=all+chapter+2+season+2+skins PDF link annotation
    • http://ggmtc.net/userfiles/files/zubexodelenanufun.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/25409721733.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef94fdec80---pivijajijunazazanog.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/30cb865eb036d3052a487309b00d1ba1/kaviv.pdfIn PDF document text
    • https://soechi.net/userfiles/file/19526364777.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/71163552911.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/3760601908.pdfIn PDF document text
    • http://funagamex.vn/PhuongNamGroup/userfiles/files/neziwozena.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/94973379663.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/pilukapitijemopekumogo.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/jetapibu.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/38375216496.pdfIn PDF document text
    • http://otohyundaidanang.com/uploads/image/files/17097208457.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/83c0e0f3e0c7d2103e848263889dbb65/68791410272.pdfIn PDF document text
    • http://nhanvietgroup.com/demo/xay-dung-tnx/upload/files/sefowewe.pdfIn PDF document text
    • https://netkat.in/ckfinder/userfiles/files/dimulezolimisikasisitomi.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/d09ecaccb5ecd3013ad76f1f902f73b5/semafivumokubizenarajube.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/jadiv.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/vunozitutisa.pdfIn PDF document text
    • http://lnv-cnc.gr/userfiles/file/98700960023.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/231d5fbceb4c0a7e9d1d07e35e082dbf/jodekitinejejofat.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/xijul.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/2dc31cf2b738abbb7f0d3abfbe1bab66/fatifujixuwi.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/59495447318.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/50466216918.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/velujebizogidusatewivawo.pdfIn PDF document text
    • http://villkasz.hu/editor_up/jitirosagurofebu.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_off0000c78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC78B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA2 10664 bytes
SHA-256: 1317f87ccc2e48dbf319e49f939c9a07dd19b619cd3344db8f949ac020719bd8
font_02_sfnt_off0000f823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF823 16920 bytes
SHA-256: 2e5382645641f14202428cc4ff0abb7ffb8cb9803e29f0d67ad19062335107f4