Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f1cda16fb9cbafe…

MALICIOUS

PDF

89.4 KB Created: 2021-08-21 05:17:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: af649f46f27440712a4d74d55f8ba534 SHA-1: 2578c474a5fa449c06200ba57adcf42dfc87bf27 SHA-256: 8f1cda16fb9cbafe4211e91dcb7505d1a5cce58a347664a3bddf5f4c46360c1b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised websites, many of which host PDF files, suggesting a link farm or redirection mechanism. The presence of external URIs and link farms on potentially compromised CMS uploads indicates an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/84b55393f76cde00bc475d6b8137d0d2/zubujem.pdf In PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082266675573---28793450915.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d34acf9d199---61593603016.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fde05734b14---kebujapulifi.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/konazasaxukuge.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607faf213572c---40679288854.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/b4cabfe5946139430a4faaa61ef579e4/38702807908.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112eee61c2df---nobogiteva.pdfIn PDF document text
    • http://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/fixelogipexalunavilazo.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1609217a4f2f5a---wuvug.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/spklc8jeegtpbbcdeejp8rgr9r/25751116076.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/1f780b5e6e9ea5f0ece90534a44614ba/mevufinomupo.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/jadix.pdfIn PDF document text
    • https://amblamy.ee/upload/file/folataz.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/75437879770.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/suvudunukizefalikofazako.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/0d6687da6c74a4a2b2dbb23cd1c45dc3/64750754955.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e8010d2c86e---97359996319.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/lezapebogogadekibekulaxim.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/18482170324.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/19080806318.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/14824134885.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/84ada8940bd55b8c34abc0da5b458c0c/rinolebo.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5ed266dc0---fugubitomufovukevukig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=pak+navy+sailor+jobs+2021+advertisementPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e15d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f96e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96E 16068 bytes
SHA-256: 626b7c8f39d92c15a08a3ca4bc52fbf6ba2648b461fd8ff24e7d9852eaf99fa2
font_02_sfnt_off00010e86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E86 17300 bytes
SHA-256: 1a00d208ddaaae9c96a10f8a5b753b7ef0ec2a522f4438b97e24bbd2dc310de8
font_03_sfnt_off00013bf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BF0 11248 bytes
SHA-256: ac9d46bc1f5ca3d3cf7749346c24f8d261c4259d94d6c4def1940bf089d9b10b

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