Malicious PDF — malware analysis report

Static analysis result for SHA-256 645cb5596c5022f3…

MALICIOUS

PDF

90.1 KB Created: 2021-09-19 13:24:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e8b1e88a2b3479689b5453caae123207 SHA-1: 9525afb78e05ae7f7e4ea535bff34caf4b4b2ea5 SHA-256: 645cb5596c5022f3b0f733eefc9d1b2009ca9f01108c4301a0cbb4788b7d65e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mallncart.com/userfiles/files/filuruwisaguwiduvulotozo.pdf In PDF document text
    • http://autokolcsonzoszolnok.hu/admin/fck_upload/file/pozixi.pdfIn PDF document text
    • http://eegbiofeedback-leszno.pl/userfiles/file/pemirotizogigobonuze.pdfIn PDF document text
    • http://ort168.com/upload/ckeditor/files/nisanabovi.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/wutuvikalogufegiwugiw.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/e4005b25ddfa841f2b2b4035a2cb1164/venuxokoz.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/28915549866.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/panedurik.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/xatajaxikif.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/voviwikogava.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/gubopujegolopo.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/dajawi.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/50508782499.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/venowu.pdfIn PDF document text
    • https://fobh.net/userfiles/files/nevukenumefopiropag.pdfIn PDF document text
    • http://mobiliteit.nu/files/86529529397.pdfIn PDF document text
    • https://radio-aurea.eu/files/file/mavigiro.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/56291156523.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/wumupebagapotuweg.pdfIn PDF document text
    • http://atomleasing.ru/media/File/mozediruzaluvugigubonaf.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161432e1a5e40a---26505761614.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136389700005---52209963475.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/39056104653.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/39159398586.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/35355277529.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=anne+of+green+gables+read+online+pdfPDF 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_off0000fc4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4B 10696 bytes
SHA-256: b2475893a2bf407983f260f5541e92504e6495b364853c0f3aa39ebdc53877ad
font_01_sfnt_off00011483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11483 17656 bytes
SHA-256: 4075f6a90fc360bca57f4716843a18f9d2b3b64a03d7f4805c27d0604d916873
font_02_sfnt_off0001421b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1421B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.