Malicious PDF — malware analysis report

Static analysis result for SHA-256 657ecb9be2cba178…

MALICIOUS

PDF

82.8 KB Created: 2021-07-13 22:18:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: aea5812a39cc2987358d71a744cf1085 SHA-1: bc41bc1afe8a809b17e863fbd8a9071c05e6172c SHA-256: 657ecb9be2cba1784740f37d937e2e0dd7d17ac59deca9dfdfe0edd6ee961ae9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, with the PDF likely serving as a lure to external malicious resources. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/a3d93fee0548f51fa1222c9c0f373607/34825898011.pdf In PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/10473136107.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/c3bba1bd13e84b6ae27b87d28e006d2e/rajejugon.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738334d2107---2357193076.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/7366bf5a7a5b5663cb3806edbb924aba/90275054002.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/10695022b9aba399e2a10e8b14fcafcc/difixatofotonixiviremur.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c33fdbd2703---wuxikewemoduxawawaf.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16099b538f4021---rakarudozavuvadife.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/jg7m6u21bpqqm82ruk8iomm8p1/41684726163.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b169cb77bbf---86233037644.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16093b8dd8c1df---juveribupubusixiwutedak.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/lrm1m7110q2sbk0258lkh76s14/pirusivitowigepaf.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160737181d10c3---dirotunibibifebukejoruz.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/6411539289.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/bafobeza.pdfIn PDF document text
    • http://asustainable.com/global/file/texiko.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160723b68087a9---vawirenedozub.pdfIn PDF document text
    • https://actorconseil.com/files/file/titokapuvanivuwagase.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/xeguruvi.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/37394095123.pdfIn PDF document text
    • https://novzelandiya.ru/ckfinder/userfiles/files/redosifetinakilofa.pdfIn PDF document text
    • http://thietbixanh.net/uploads/files/26812405530.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/94901252361.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca752cc4f6---44741687210.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=smoked+salmon+blinis+with+cream+cheesePDF 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_off0000d9ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AB 11028 bytes
SHA-256: 317f5bfd10455b13c804fe8673ac612d93274dd73d9a3eb7d5d4c3144fcec385
font_01_sfnt_off0000f32a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3C 18616 bytes
SHA-256: 2de377b29484fa23f5aa369524f88d0854e83aa24a462a3aebd69d24ed86bf24