Malicious PDF — malware analysis report

Static analysis result for SHA-256 928a49dd0076c633…

MALICIOUS

PDF

79.4 KB Created: 2021-09-05 19:55:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 28ffc3fb0ad20e10dd1b63c1d4d8e47d SHA-1: 667e3301a0b238564ac47c2ed1939413c3b7eb20 SHA-256: 928a49dd0076c63398fa869b0fb08b3ec3c82b091daebdc29c7ef4aefdde6e85
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a significant number of URLs pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to obscure the final destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac9d51ee89---lewuxavuboxive.pdf In PDF document text
    • http://dansungsala.com/uploads/files/diwusuzojurerazudi.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/kobomorilepabekasa.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/zapogunuvoxax.pdfIn PDF document text
    • https://sce.tw/uploads/files/6106341865036.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/82750471843.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c727496982f---xibifizagokaguwutagit.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/tekotedilev.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210707_B67A799136477742.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/runagenukomil.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608692ca00644---85048501271.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611310c08517d---zotiwumus.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/46177336003.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1612c118c4c61d---wunonaze.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a2c7e4987---28106068966.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/88054320095.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/lugujokavofukumipaf.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/9aiov4tb5ohbt0fj0ri3vm07ak/82339969536.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf43fbdfe28---53683689926.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/lpnmh8eov8ioklr7ocuma06di5/5244570873.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a580b44f2d---verexegujemumesazivurutet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=balance+of+payment+chapter+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_off0000d574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD574 10792 bytes
SHA-256: a90fd8ec4bab33610c721c9dcd1132c3c937604ee3d1376b3327d3bedcc808fc
font_01_sfnt_off0000ee29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE29 16384 bytes
SHA-256: d182f21d37a81fb79f63bdf4232736201f430e9b03800bec67733cb2e1d03604
font_02_sfnt_off00011838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11838 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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