Malicious PDF — malware analysis report

Static analysis result for SHA-256 251e4375178e3a48…

MALICIOUS

PDF

84.2 KB Created: 2021-09-11 23:26:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c6203f3a68e68ea7bdbac14a75bdcec3 SHA-1: 3fe7f3220b4ab57c4a49d88b2b45e46423d48742 SHA-256: 251e4375178e3a487dd65e9c7061cd2c83d15c3f2f5779c73aa6bf842ab48878
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised or disposable hosting sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded links and the PDF structure suggest potential exploitation or redirection mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://e-photo.lv/ckfinder/userfiles/files/25166575221.pdf In PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/44355385171.pdfIn PDF document text
    • http://panova-art.com/files/file/bofodutadutujutokoget.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/jekositu.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/2f1a559dea5a75610472ca4de75f02dd/3971040673.pdfIn PDF document text
    • https://slide-bearing.com/d/files/xizubudufujinijovagi.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/zemagojumizodopet.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/67008715550.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/8595139333.pdfIn PDF document text
    • http://quimicahj.com/admin/userfiles/userfiles/file/timivuv.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/44947509524.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/8896996854.pdfIn PDF document text
    • http://cosmeticdermatologymiamibeach.com/uploads/data/files/vinijozos.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613826d88961d---52756605017.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/63567815612.pdfIn PDF document text
    • http://psychologadamczak.pl/userfiles/file/faxuwopeje.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/53fb3e0480977e4c792c72ccb4fa2aa1/wulanigolenejugosila.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/mitazawisigot.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/90373606067.pdfIn PDF document text
    • https://doan295doson.vn/namthuan/images/news/files/naxezirorowiwitewapej.pdfIn PDF document text
    • https://collinite.pl/userfiles/file/58051957268.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/panarowufodixot.pdfIn PDF document text
    • http://badgerhillfarm.uk/mirupukudituzu.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/31516189607.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/70530497665.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/30313491140.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=download+droid+hardware+infoPDF 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_off0000dd03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD03 20680 bytes
SHA-256: e6c849c99f84c5d49d9bd0d50d0a038bf7819a4e0b303c065a55422292c3856d
font_01_sfnt_off000113c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C7 10272 bytes
SHA-256: e1ceccf3fbef8fe0d4e086b1151d779864ed0d44d06667c83336311a609da23b
font_02_sfnt_off00012acb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ACB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1