Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a4450a5f5a008cf…

MALICIOUS

PDF

73.8 KB Created: 2021-09-20 09:12:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 04d64d8a1b41e6e1bceb9dc1fba4a16d SHA-1: 62b9804808e07b0e35fd18214d90ecebf664da4a SHA-256: 0a4450a5f5a008cfa65710cdb3eb1e71a48f38addf01ce72c2c3e8584a19deb5
196 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external PDF files hosted on a variety of domains, many of which appear to be disposable or compromised. The heuristic firings indicate a link farm strategy, with some links specifically targeting compromised WordPress uploads. ClamAV detection and ML classification confirm the malicious nature of the file, likely serving as a lure for users to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://1-sanya.com/blog_images/blog_/file/famunad.pdf In PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/vuvifagataxom.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/86739546548.pdfIn PDF document text
    • http://hladonural.ru/upload_picture/56121480563.pdfIn PDF document text
    • https://derya.afmiletisimajansi.info/resimler/files/vofejojodiraxexowag.pdfIn PDF document text
    • http://vln.nl/files/file/pimadifovatuz.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc172eed5c---nonenibikipifosepu.pdfIn PDF document text
    • http://cppzone.ru/users/blogs/file/berosedobo.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/27438284852.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/najiloze.pdfIn PDF document text
    • http://df-2.de/images/daten/file/88301483864.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/66635917736.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/gisufugib.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613618d4ead74---72590411592.pdfIn PDF document text
    • https://grandhotelushba.com/userfiles/file/jonepumujule.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/gimoxonudoxumemoxerifuzu.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/16242321837.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161434545882d7---79377854018.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16139e7044e769---fudoloxolekujib.pdfIn PDF document text
    • http://iccjsc.vn/images/uploads/files/jodafuduxewedav.pdfIn PDF document text
    • http://zgic.ru/!upload/files/33339987422.pdfIn PDF document text
    • http://fruitvita.com/files/files/45502613364.pdfIn PDF document text
    • https://jf-orvalho.pt/userfiles/file/bajimeg.pdfIn PDF document text
    • https://ags-car.com/upload/files/36408576053.pdfIn PDF document text
    • http://shinyoungvalve.com/userData/board/file/xizulemijefor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=god+hand+ppsspp+android+game+downloadPDF 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_off0000be86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE86 10864 bytes
SHA-256: 4bbfd988fd4c15aa30cd1b72a0ef51bcedac4f3bb851be66de8267239b0fec10
font_01_sfnt_off0000d741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD741 16448 bytes
SHA-256: f6b05a084d79dd9aad1bfb85ffd470bdbdca8eb728f40c2ab19f052c3e3abb63
font_02_sfnt_off0001018e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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