Malicious PDF — malware analysis report

Static analysis result for SHA-256 98a34c9d7b745d41…

MALICIOUS

PDF

91.3 KB Created: 2021-09-09 05:14:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2ec1968fa07a125bf600d1908be68eb6 SHA-1: 13549c888bdb5dcbbe945464beb4d5c58138a6f5 SHA-256: 98a34c9d7b745d410a0f61c1474ba8240c141622e173966ce5749ff03a15b906
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs, many pointing to compromised CMS upload storage or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the link farm and the embedded URLs suggest it is designed to redirect users to malicious sites, potentially for credential harvesting or second-stage payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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 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://chaodontuonglai.vn/uploads/ck_upload/files/gejiseboxadopebavegoruzo.pdf In PDF document text
    • http://w-f-l.de/user_img/file/33555223327.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/a183425a41f72eefd15b632d48d68718/1308145800.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/29684809173.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/91643752782.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/5019791e80c14256c2d124c979c39c21/porigavazekinefuwifuvute.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/50317384250.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/77021881343.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/luditakuli.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202109031436287026.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ca89bce40---1879191497.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/matipedulofo.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/58686754772.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/bozisapoxorefe.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/50489100697.pdfIn PDF document text
    • https://digireg.com/upload/62916560589.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/42371691641.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/92096186984.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/52447809630.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/93094549104.pdfIn PDF document text
    • http://www.zaluziemalina.cz/userfiles/file/gamomonugo.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/fd841502fd5af4768ec15a508f13a5bb/38402776200.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/89583585961.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=fmovies+free+moviesPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011d12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D12 10008 bytes
SHA-256: 898ab72db4d63f3b6a7bae3c28875fa336d39fb3c7800a0e85b5c3999080bb62
font_02_sfnt_off00013348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13348 17376 bytes
SHA-256: 589993232c2dac6822fe5aa7b5ddb749564bdd6dbfdac8a1740694eadc37dda4

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