Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb39b7408a1d678b…

MALICIOUS

PDF

87.9 KB Created: 2021-07-23 18:47:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 0909623ab045bcf537fb9381192c1e3a SHA-1: eb8a80707bb1338e76254ff4d54cdce448c9180f SHA-256: bb39b7408a1d678b150acb716aaded426a50a40bbed9249ae19aed0b39ab6cfd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/96a14c59afd1429b808477c865447187/16933739078.pdf In PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834bc36ecb3---68100435049.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609381df47b13---pibirodufibi.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/e0698c76e99bcb3b525b7169d88b247f/10588767231.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/rutasepiwokabesez.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/fb832d6b9ff0c0002395d586e94a6fdc/senukuzoma.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c985c9c6db6---52194933504.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/girawotosebafon.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ba79b8f9b---33588703613.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/e4aced02fa1ae7206a78d2a9631755cf/ketuwot.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/62589599039.pdfIn PDF document text
    • http://maxbrio.kr/files/files/68001867551.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/5182427903.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160761235295eb---6918547700.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/temulu.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/xemeju.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c1cb5daeb24---teterasosuvubatupajoz.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0a180f4d8---1619221311.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/feluwumizezusaguvudetoz.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/sizovekotolaxarif.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/f504967d2166ff75cb8ecbcd5a84c206/77972034200.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/e1d79e2b44422ea7662916c13d2275d9/delijavagepisagopiwobokox.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/e9849de710db084f3bb01daaeacf6d5c/darutuda.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/rc3kren2r38sbcqaiovahclbpp/609839341.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/31675278381.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=what+is+recall+plan+in+fssaiPDF 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_off0000f5e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E1 10448 bytes
SHA-256: 20d7cc72f862f371389bb3097e5ab21ed13bcc140a20825f69a628f08caa7f69
font_01_sfnt_off00010d87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D87 17280 bytes
SHA-256: c3eccfea0c8ff866a5146b4e56016e066087ea5276addc0bd83b138dbc7e20ce
font_02_sfnt_off0001391c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1391C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1