Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7df51912511e918…

MALICIOUS

PDF

70.3 KB Created: 2021-10-04 00:04:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d6f164e02d717f1b7f7b9c75102064c4 SHA-1: 317741c0b1d46669d2cbd255e882a62971eb8b8b SHA-256: a7df51912511e91874a79637f2ace93cb30e61c0504d29d0fdac753e84c3b4a8
196 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to compromised WordPress sites and disposable domains, designed to lure users into downloading further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was unreadable, limiting the analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://superiorservicesandsolutionsfl.com/nbloom/fckuploads/file/40187061664.pdf In PDF document text
    • https://rafaellopezehijo.com/upload/files/gifurutuluvujurixoxijon.pdfIn PDF document text
    • https://harley.dataroom.tw/upload/files/rilewubam.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140abe99d01f---64800802689.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/tojetinefiliwisaxowov.pdfIn PDF document text
    • http://jutaek.humenia.com/upload/userfiles/2021/09/files/210905040045.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/161519d86a955c---rowatorabazidomesix.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-10-4/20211004050144817874.pdfIn PDF document text
    • http://proxima-design.cz/files/file/vigavebewat.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/rutomakexodowinawumuze.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378fc1b4380---53049172181.pdfIn PDF document text
    • http://mrcubezpieczenia.pl/app/webroot/media/files/29542982236.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/vuzisemenowidelupibed.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/buvivuzitexesas.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161422a7c4b299---vixenuteronifosulotu.pdfIn PDF document text
    • https://aahs.givingplan.net/sites/default/files/editor/file/40793121372.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/boten.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/jonakabej.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614ba4fcdfeef---57682679446.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/81239535654.pdfIn PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/sivisulagokaposubej.pdfIn PDF document text
    • https://tmtteks.com/files/30329062378.pdfIn PDF document text
    • http://ideal-site.ru/userfiles/file/luxozuligazewisix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=english+exercise+for+grade+6PDF 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_off0000af7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC796 10912 bytes
SHA-256: c8f324151c69445d84d50e05f3ba629f691409b284de44300ae7b5496b53fbc1
font_02_sfnt_off0000e091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE091 17080 bytes
SHA-256: 8bc4317abe7d5d542f0b5f8220d1c4fc498522b458629c0fdf9acb2a64d34a6f

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