Malicious PDF — malware analysis report

Static analysis result for SHA-256 749074f8172be8a5…

MALICIOUS

PDF

71.6 KB Created: 2021-10-02 09:38:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0cc1a7b19c99fb7ab33086f098de4ecf SHA-1: dbf58e5b1df72bd41c724e686023ee64bd2847e8 SHA-256: 749074f8172be8a50408d313bce52b3e89f9418733c5865364ffc27e819930f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains a link farm with SEO-optimized terms, likely intended to trick users into downloading further malware. The presence of multiple external URIs and a compromised CMS upload link suggests a distribution mechanism for malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cructi.ru/uplcv?utm_term=chicken+soup+for+the+teenage+soul+pdf+free+download PDF link annotation
    • https://castel.ro/userfiles/file/89770621091.pdfIn PDF document text
    • https://tidaksusah.com/contents/files/6088815112.pdfIn PDF document text
    • https://etadelloro.it/images/file/fovewu.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d2adb12eb---xorunafigavukorukaturiloz.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210923032100.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/xilakusafopogor.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/bisit.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-10-2/20211002064826884075.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/sofemi.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/57268006856.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/luligobexixepuguwiwu.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161475f16e1945---xemisaxu.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161578f0d0c461---19024057227.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/waboreferakabinudedera.pdfIn PDF document text
    • http://stilna-ya.com/_userfiles/file/10506398960.pdfIn PDF document text
    • http://willajarmar.pl/userfiles/file/35192511281.pdfIn PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/birerimenanadosed.pdfIn PDF document text
    • http://naso10.com/userData/board/file/banorimajanunulefuxa.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/pijopupolojop.pdfIn PDF document text
    • https://rjpexport.com/files/37668434158.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name/files/71242138626.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbd72a7327---28635536268.pdfIn PDF document text
    • http://haki.vn/uploads/files/15394345715.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/9475767599.pdfIn PDF document text
    • http://seger.cz/userfiles/file/puxijunuto.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_off0000b4aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4AA 16188 bytes
SHA-256: b11c2427424f2bca9c22103ae0086a9d326dc32c141a708eaef680b4a26248dd
font_01_sfnt_off0000de0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0B 11208 bytes
SHA-256: 771dac1be3c85c77ad2411c6ed17405a58d0d8fa61fa7ae05790f761f5ba5398
font_02_sfnt_off0000f829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF829 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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