Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e5fa221abbbe141…

MALICIOUS

PDF

81.7 KB Created: 2021-08-21 01:11:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d20b84e4688feca3ea82b358ef781ea3 SHA-1: c38e1f8297ca248613970dbd7d42b75461a46dfc SHA-256: 7e5fa221abbbe141c328bb0a802a71c5abff73c3cb9f2fc5b4b727aeff242067
196 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_RANDOM_URL_LINK' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly indicate malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://kwong-cheong.com/userfiles/29880382305.pdf In PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/bokikafolomapu.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/914578555.pdfIn PDF document text
    • http://yuanda-boiler.com/d/files/30696323816.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/dc2b33e5b03eed0b9fb57035c2eba32e/wusifutebixoj.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/bumad.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c27acb7767f---77464603536.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a49b5301f0e---83639794443.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/36110908222.pdfIn PDF document text
    • http://m2m2design.com/userfiles/66055541994.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16118f1f54aa71---todipazalu.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609511fa9500d---pukosa.pdfIn PDF document text
    • http://amandamaitland.com/images/file/pizunigodoz.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/47689752254.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/fiwokogorera.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/guzuzupabukefobigitubek.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160c1096e71cee---94755199946.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/4826862681.pdfIn PDF document text
    • http://fourfoods.com/images/files/pabiwadimozokik.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6aebb76628---42751679218.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/salow.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/wixabi.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/rufolat.pdfIn PDF document text
    • https://immobilgold.com/file/bavoxigetazosoromexorab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=qual+a+raiz+quadrada+de+1000PDF 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_off0000d8e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E8 10292 bytes
SHA-256: 2951e0c56898264d4de6294e7cde1d7941ca873bba61f088b3ab12e06fdd6287
font_01_sfnt_off0000f011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF011 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10823 19508 bytes
SHA-256: 290aefed1e8779311bb882c3a81dc9ca97df966a389b92b40db6fc38004e6038

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