Malicious PDF — malware analysis report

Static analysis result for SHA-256 a45680f6a7c397a8…

MALICIOUS

PDF

84.7 KB Created: 2021-09-02 08:22:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3edb0e6a97e4edcb4cfe576422cee8bf SHA-1: ef4dc6546eea5920370bbdfebca3e128cca93b00 SHA-256: a45680f6a7c397a8e0f901918105741811e3da578bc23c916ce6cc53a9f9e6a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to compromised websites, indicating it functions as a link farm for phishing or malware distribution. Heuristics suggest it's a link farm on disposable hosting and potentially a compromised CMS upload. ClamAV and ML classifiers confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=distributed+energy+resources PDF link annotation
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/db82a4f59a001eb433524da262a15a8f/92816406789.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/67126403956.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5f8d3dd97---79239678189.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/a99e92f7babcc4f6c99ed30c837e2dad/65914974384.pdfIn PDF document text
    • http://alphaconsultinggroup.us/vpw/images/file/rugururulibu.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607be0cd2dd9a---vukilepedesefilurunatelo.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/15183393503.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a96ab5065da---mejabefopulozepo.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/49097452ccd57b333241730af36172b8/sutinoguxe.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/21104940009.pdfIn PDF document text
    • https://autoskola-scp.com/files/faburakukopabakisi.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/27835232656.pdfIn PDF document text
    • http://rcot.by/pics/files/29178371157.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098a349dd960---zufekodu.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/mufajekatumosaxipidodug.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/38984240775.pdfIn PDF document text
    • http://e-sportis.com/images/upload/ranebemofitimutaz.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160a26d2b9d1cb---sotiximij.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/lutufazevuzanepokolil.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109cfacb3072---17263381833.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/84165539102.pdfIn PDF document text
    • http://interference.ajoda.eu/userfiles/files/narabutejeginozasuparafeg.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/7b20o988eq3j6f3h6nojkkg0n5/zagusetifedupib.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/54061131897.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/85816411103.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_off0000e33f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33F 10692 bytes
SHA-256: 1355ef3b9801e3a509494303d04e24b14f414c58e1782aa238255d4a2b00e0a8
font_01_sfnt_off0000fbbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBF 18244 bytes
SHA-256: 957ba77b3478efa6534048f06d58744798d7bd0722b3963be688c5f057bf019b
font_02_sfnt_off00012b8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1