Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0707eaa5c53e8dc…

MALICIOUS

PDF

110.5 KB Created: 2021-09-07 10:03:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c5e85553482ff9c91fe4e827eb369d81 SHA-1: f04c39254cdbe81f96a28fcdcda84bc233a47e1a SHA-256: b0707eaa5c53e8dcfccb4190778bccf1bfb5ef9d456245aa2510d73d242460e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/9t1qa7nb7i20bnidq4kpf8tt3h/vapitozorogowopufuwasudu.pdf In PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/9irje581aqj1edfmf0d0snrts1/bipojomoxolarananek.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/cbf3b064da059c85aa50f35f59af63c6/jijowifivibero.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/bodugowibuwimibot.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/kekovuzobedu.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/bfvajpa3b0mogku6iugr8sg2j5/rupop.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f20c0e2d31a---kebunujusok.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/videronejokevufelasike.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/c124ab1b9682ede4dcb44fefae1967ff/88643776070.pdfIn PDF document text
    • http://lngpetro.com/userfiles/file/nemenosibugukagezuzab.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/t0n3j6996cb1fjbsga2rihva05/31447497674.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/24015974450.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/d84e9a7587e1052e3d765c15a821dfb5/gafadegosasodipifoxoliwo.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/12efed213556f30f547223ec6080e43c/79604923155.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e645b2f1b.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/jetusedazovemexisope.pdfIn PDF document text
    • http://ornito-silesia.eu/userfiles/file/riravanewulozowabokizavub.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/ruriweseladakekuzojonodev.pdfIn PDF document text
    • http://underbutter.cz/download/foto/72637567626.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/xafuw.pdfIn PDF document text
    • http://varanini.pl/userfiles/file/30779344916.pdfIn PDF document text
    • http://web5gstore.com/Files/files/79720852489.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/zosasabatelafewuzu.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/voduxamokaduxipexef.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/37868477572.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=contoh+daftar+riwayat+hidup+untuk+lamaran+kerja.pdfPDF 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_off00014a8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000162a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162A1 11216 bytes
SHA-256: 077b247483f20b3317be1458c7ba49863cecb2ab22bf55f2d39a110eeeb2b81b
font_02_sfnt_off00017cb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CB8 17188 bytes
SHA-256: 25929f524794ab88058aee939c7743499f9a7e9b1e51352559c3804d0efc3202