Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec824f84b628eb64…

MALICIOUS

PDF

104.9 KB Created: 2021-08-01 16:57:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7b1cab001cfc94e8d87aa479cb2e975b SHA-1: 3356e0dc0db12405fcd76cc55813b0e54b8fb5fe SHA-256: ec824f84b628eb6415ecd249f4b1c477e1cc382569b1f9c791e56a2f43b70116
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which point to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content. The 'SE_INVOICE_LURE' heuristic indicates the document's content is intended to deceive users into downloading further malicious files, likely disguised as invoices or payment confirmations. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://www.heksan.com.pl/file/ramoxogitosuwagim.pdf In PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/ffd62c47d9cfc650afd31cd1388993ba/vepezomogoxorufa.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/66479121393.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/24933522958.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/27811583685.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/surokiwivokuwulurejom.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/72e71b6b73588f69f8de826243f426cf/xabimepow.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/bikonatomug.pdfIn PDF document text
    • https://cooperspick.com/files/dewanepozisexasareno.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/62549475479.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/47311703110.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/df45127b00a8fb810e8430e8e9926262/sumal.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/1d7f228f3b2ffe418be55ac3d4fdc415/monewerawimuronuforam.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/mupakilujubisubotasabe.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/e3eb41c80a1fd1d6e3f54703519f7072/kosavezobukubadal.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/4rrbn4ln9p0m6p6boadrqbd0g1/mubenaj.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c587935ecab---86936185430.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16088e207a9fbb---fezalezomuvotevokona.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f039917ada3---6817729673.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebecd1968c---gusumazuxun.pdfPDF link annotation
    • http://studioagronomoserragiotto.eu/userfiles/files/7157032324.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/b75bb3f3d54acf46d8f4ca568481eb68/roduludexorebimonumabu.pdfIn PDF document text
    • https://melz-feu.ru/upload/bujiwudu.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/5fd4154a18144a1a0c50f43ed6815be1/dilobewozotisu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=accounts+payable+ledger+examplePDF 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_off000135e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135E0 17480 bytes
SHA-256: 3d23164bdd90f8696734bc8bcb7dbc0a84eb9c88fffb117054ddcd6511ea3f06
font_01_sfnt_off000163ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017bd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BD1 11204 bytes
SHA-256: 05bd890f8a4fcca8f2a9e77d00d8186b0023be9b82b39b31ca34f88a8b4a338d