Malicious PDF — malware analysis report

Static analysis result for SHA-256 18ac84ae7a513c45…

MALICIOUS

PDF

81.3 KB Created: 2021-09-24 04:43:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 408a4e73a8b352f4e627a469db7c6404 SHA-1: 9c2853fb89b8e8e41e816c9a9f1f1fc84e929f80 SHA-256: 18ac84ae7a513c4530e3fb5b186be2b50ba4f640d086328ae383c0852b345f23
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially malicious files hosted on compromised WordPress sites and disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading further malware. No scripts were extracted, but the presence of external links and the nature of the heuristics point towards a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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 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 https://piphoto.tw/uploads/files/202109231720073941.pdf In PDF document text
    • https://mcdelandes.ca/uploads/file/wilukadazeni.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/22166084481.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/fabedijitopagalilosa.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/ludunebutavolipiwasilasat.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/43192931343.pdfIn PDF document text
    • http://moneymaker-gold.de/files/55375535384.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/tagenozi.pdfIn PDF document text
    • https://dulsuc.cl/userfiles/file/zupowezepufi.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/debev.pdfIn PDF document text
    • http://zae.me/datafiles/file/kewutugijatunefomofib.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c321f3f62f---36813067819.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/74674594790.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-2/20210902101252309819.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16137c4683901f---bezagitijumezel.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd25d03618---29815320002.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/38997112581.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021090416350073499.pdfIn PDF document text
    • http://ahchala.com/img/file/62609969894.pdfIn PDF document text
    • http://styropapex.pl/userfiles/file/gerepo.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/94908465941.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/disaxobexojej.pdfIn PDF document text
    • http://yejiya.com/userfiles/file/xasefudegabinila.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b70d8d42e3---beroxovifetuxabuvoga.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/ds557cpp66duncdvf7t2qlnok7/75689231199.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=dragon+ball+fighterz+apk+without+verificationPDF 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_off0000d5f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F1 18644 bytes
SHA-256: 06c5d7adff6c38ff4e6a5290820ee9bd4a065b156596cc6fbb7b4bd5f80f30f6
font_01_sfnt_off000105ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC2 11136 bytes
SHA-256: 1c20b5c6eb4fa2d1bb90dea8c37b4abf46f88cc79cb6d30e7d24189f8cec0f2e

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