Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1d8ed12987aba59…

MALICIOUS

PDF

83.1 KB Created: 2021-09-10 11:09:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bf05895019023cf790f5de011aa472a7 SHA-1: d170136eb4645ac7b5a17d6434aaa3e751b81907 SHA-256: a1d8ed12987aba59e81ce91a8555aa7870273bbb84d58ef86695aa406d7ebfdc
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many pointing to compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to download a second-stage payload via the linked compromised upload storage.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131669293acb---xoxaguluzukivinoxu.pdf In PDF document text
    • http://dges.in/userfiles/file/xoxedagi.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/48970544200.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc1dc6e4e2---38032166302.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/72345982401.pdfIn PDF document text
    • http://klpa.net/userData/board/file/6039388938.pdfIn PDF document text
    • http://edukoc.net/userData/ebizro_board/file/55752210176.pdfIn PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/tezudasi.pdfIn PDF document text
    • https://studioconcept-stand.com/fck_userfiles/file/65452848513.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e14260233---16393047190.pdfIn PDF document text
    • http://turksebruiloften.nl/userfiles/file/65056442740.pdfIn PDF document text
    • http://sreema.org/FCKeditor/file/kibavakazakukekogov.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/rojemobivujivowozavow.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/59256975261.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/23499256623.pdfIn PDF document text
    • http://fuguchair.com/upfolder/e/files/20210902023232.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/469741189.pdfIn PDF document text
    • http://ikcem.org/userfiles/file///22022518650.pdfIn PDF document text
    • http://lonniestireandauto.com/nbloom/fckuploads/file/subenomufukabusa.pdfIn PDF document text
    • https://isitekmuhendislik.com/userfiles/file/nedegiw.pdfIn PDF document text
    • https://zd-zeta.com/uploads/files/202109071830375506.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/36d6dff67e1ccb8af804d3cc17e8a604/modozonuwiludazomajunuze.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/xafukodawipewibuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=hunter+assassin+hack+apkPDF 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_off0000db84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB84 18960 bytes
SHA-256: 1a8050983ab56b7abb0318aeb376f531279087ba8070a0cc44fbf7d9e76f52d9
font_01_sfnt_off00010da3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA3 10488 bytes
SHA-256: fb3d960d6231237c396e46e55169046e03152dc72bb3d99b344e2113285f04b1
font_02_sfnt_off00012566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12566 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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