Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0ad8b46866b3d4c…

MALICIOUS

PDF

72.7 KB Created: 2021-09-26 19:21:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 33ee08c3e8db28fb825f34605bce1239 SHA-1: 01e562e86b44d561de1ac122e798c3537da8d928 SHA-256: d0ad8b46866b3d4c1b44015f6b8c26bdb9d70745deb1bde2cbf48ff36da8d830
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs and link farms pointing to external sites, suggesting a phishing or malware distribution scheme. The presence of external URI heuristics and link farm indicators further supports this, as the document likely aims to redirect users to compromised or malicious web content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://nomylo.ru/uplcv?utm_term=rdp+android+free PDF link annotation
    • http://helloslow.com/data/userfiles/files/78036028315.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/d2f9f326e86dfdcb8b1a2154d516583e.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f965a1455e---tupujepugap.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/fafizopugodolir.pdfIn PDF document text
    • http://midospa.com/upload/files/fasufizado.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210902125126.pdfIn PDF document text
    • http://archiw.bibliotekalesmierz.eu/img/upload/files/gakig.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/kabinebexexatosapuminefen.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/6500585191.pdfIn PDF document text
    • http://all-premium.com/user_file/files/botabutasivo.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f141f78dbd---pitarabiroropexawo.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161435e14c82a8---54775090978.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/f9cd9cea981ccc66c96acc2dc39e1334/17950293758.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/54042238141.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/96813461568.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/pafusitebupagekewigabe.pdfIn PDF document text
    • http://allycatering.com/userfiles/50791149759.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/gatupasakexuvifede.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/96261865665.pdfIn PDF document text
    • http://warmistore.com/userfiles/file/veruxudakixubekamu.pdfIn PDF document text
    • http://flairpens.ru/uploads/file/20780086054.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/fuditivis.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_off0000b3fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3FD 19436 bytes
SHA-256: b791191798287945b12dcf520dbfbe38be6956bd3c585fa45ce355a2b28c2dc8
font_01_sfnt_off0000e6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC2 10224 bytes
SHA-256: bd4f630e4df305c3a94d7cf0cb017c69bac337327f435a99407aef8b4d21fff9