Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bd9b96c55f5753e…

MALICIOUS

PDF

86.6 KB Created: 2021-09-07 13:10:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d0f8ba62b8508d81b698c00e20f43eb5 SHA-1: 17ed6b38b9f5471eccd09068532c764d780c5ee9 SHA-256: 7bd9b96c55f5753e78f20649e8276d76a9201bd8388bdb6b955a23c73ac632af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous embedded URLs that point to compromised websites, likely to distribute further malicious content or lead users to phishing pages. The presence of external URIs and link farm heuristics strongly suggests a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/41b0f05e1e600c019ef5c2d34a6e3dd8/ruvozaxoves.pdf In PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a0140d80620---17660002870.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/1912175311.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085be1e6e64d---kejuwebisiv.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e4d031587bd---85554773460.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/19051718552.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/91436449926.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a0aa7494fe1---22966190678.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160ce34db6a9e5---90850306752.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff72a31ee1---jiduz.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16134cd6fa99b0---86602207099.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/73129457934.pdfIn PDF document text
    • http://thedreams.cz/files/xuwusav.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606feca901d05---bibozopunobos.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085cd257eac0---81928331563.pdfIn PDF document text
    • http://www.siposferenc.hu/html/vozelabezoradovipobim.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/4050738442.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/160799fff8e88f---xegaxigibemidoderedodo.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/67558933400.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/ramuwakegumetililubukuve.pdfIn PDF document text
    • https://artcer.ru/files/uploads/files/56621339979.pdfIn PDF document text
    • https://vinniescustoms.com/userfiles/files/potuxexafamijagone.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/waxafibuxomusujudonomudo.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/80470270080.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/okcggcva81omf6fnun0dlcarct/xupuxubizipiwiwumaxuso.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zorozezororazarafudegali.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=illustrator+export+pdf+transparent+backgroundPDF 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_off0000eaad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAD 11088 bytes
SHA-256: 7f95b8877ada8ed23647dac2aeb095f49e75b412d398b61ce2c3824b1c0601a4
font_01_sfnt_off0001044a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5C 18532 bytes
SHA-256: 8780e432bb48b077b4e5a7e7e11c574789770bb321ad8d43d121f53fa302f370