Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdceb74757ed7930…

MALICIOUS

PDF

70.1 KB Created: 2021-09-02 10:48:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9ca7ba3f62e43ba03a26e4214ec2f3ab SHA-1: fb89c508eb9057a029b827dce2dcc486f7b5ce8a SHA-256: cdceb74757ed79302fe668869274e38c7f5211c7710c365d079836c48cb452de
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other domains, likely to manipulate search engine rankings or distribute further malware. The presence of multiple external URIs and link farm characteristics suggests a phishing or SEO poisoning attack vector.

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://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/7ca3c6d02bb6cbb72fc270bdb698cb0b/96757008735.pdf In PDF document text
    • http://arisutour.com/ckupload/files/21396521414.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/0009e457674797616875e2fe65d43a2f/nogisuzurafikabibisegitig.pdfIn PDF document text
    • http://calisnt.com/uploads/files/96601901608.pdfIn PDF document text
    • http://saintthomasmonrovia.org/clients/a/a7/a774d5b45fc75aba9c6fcf07501e1e58/File/15754700001.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/d8a6e835fd31932381afbbee827c5fd2/segulopiregorura.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/fogaw.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/ranaxukesuporiw.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/7aa5666e778a787c418ca91a8652cb4f/34652216451.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/88267471901.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982a0682298---19952670282.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/1513546404.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/e7ff67681eb93f35039c55af7a13bbc3/gofirukedep.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16080161ddab04---liluvunonito.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160962f3be742f---gusedasefuk.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c96e34a964a---51061698127.pdfIn PDF document text
    • http://acril.ru/ufiles/files/jimatuverejumuguwoge.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/91430714936.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/c1b93c07724b30b12ce9dcf71805716f/lurotakepusixaxeg.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/96946940723.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/72534698303.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/pezepivugox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=wasp+sting+itchy+2+weeks+laterPDF 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_off0000b414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB414 10936 bytes
SHA-256: 566f0139da72df6938758cc0a73c76321f782644754025e173e19d3fd8ce99b8
font_01_sfnt_off0000cd7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD7D 14928 bytes
SHA-256: 64d64804f6c9fc2acb1248194c98040d5d1d6c5cc6681e714bc235aeff37e23e
font_02_sfnt_off0000f2ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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