Malicious PDF — malware analysis report

Static analysis result for SHA-256 2078e1ac4e682a16…

MALICIOUS

PDF

92.4 KB Created: 2021-09-17 19:08:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8347659b5b1ed752742171d4be4cfc15 SHA-1: d7fddadfa8e0308f8805f8c9a978ff50dfd3e03f SHA-256: 2078e1ac4e682a16c1058a34e68df467c95712386ba3335f96ca687816e63be8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic firings indicate this PDF is a link farm, with a high ML score and ClamAV detection confirming its malicious nature. The primary function appears to be directing users to external malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://philabc.ru/uplcv?utm_term=sniper+assassin+4+unblocked PDF link annotation
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/duvirutexeloxusamir.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16134989a179d1---musuxijekekonajonirafama.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/21253552762.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/gorulitobudixilajinofixol.pdfIn PDF document text
    • https://digireg.it/upload/jebaruzol.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/zedojefuxedunejop.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301f8b6731a---pivobawawotudupuzomufofed.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/nunonobi.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/19955236430.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/3ff85c12f892582a20e4e734a04c6f71/19260024404.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/36654232394.pdfIn PDF document text
    • http://lamay.de/userfiles/file/61258811988.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/22512860847.pdfIn PDF document text
    • http://jucal.es/images/file/mulukafumemalov.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/tojixevoribamimivuzizut.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/15062015156.pdfIn PDF document text
    • http://naoshima-habitant.com/images/blog/file/13511713973.pdfIn PDF document text
    • http://hakasasi.id/userfiles/file/1236294055.pdfIn PDF document text
    • http://benrassam.com/uploads/files/9001422483.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/zumike.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aea102b9a3---xaleloragorezuneradi.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_off0000ffb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB9 19648 bytes
SHA-256: a14da8b14116768946594d22cfd8d2efb26b832f261ed6ed5eda6fe5fc6b5552
font_01_sfnt_off000132d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014aeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AEB 10896 bytes
SHA-256: 40fcd22b12e4e37eaf8b0dff29e23f901fa90753c54e0737118ea0c5440d6169