Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e48d26c16a7cc31…

MALICIOUS

PDF

70.9 KB Created: 2021-09-25 06:30:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1f53eff29f09852c6856b701a018a2dd SHA-1: abc5480b6847a7c27bab9e1dfa2713c21cc28511 SHA-256: 2e48d26c16a7cc31832408dba05c82a36dcb3d7a78e82eb5ec0b54f605e7942e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 https://coretry.ru/uplcv?utm_term=pc+games+apk+for+android PDF link annotation
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133fdb03670e---14078861083.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/8115281332.pdfIn PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/61652692050.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/giwemotokig.pdfIn PDF document text
    • http://kalikraft.com/images/file/mixejamukonixo.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/8533564505.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/jt2isd3dp1v79loumec4o17nlm/4908038058.pdfIn PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/6641746662.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/55747431227.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/puzipos.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149a4f05b285---37082761596.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/mufokota.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/talagigadexa.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/tosotevafovuxamalu.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ae0da07d2a---81959744501.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/wobukovawumemapogana.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/legukaruxuvoputil.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/mudopuxivapujorovuz.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/91810328986.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/6877151099.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/poduvate.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_off0000b0b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8CC 10912 bytes
SHA-256: 116de7417d425ea648ac15330445c3a95a5ce7f5e69b673e05ec8077011867f7
font_02_sfnt_off0000e1d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D7 17020 bytes
SHA-256: 63e021f5690d651a10de48496e3e5b21a2d5a3f3a5475fcbbe818f87b9f2a877