Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ec8c669efcd7336…

MALICIOUS

PDF

85.9 KB Created: 2021-09-17 03:25:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 27935e2deeaba169f20a3b31437f70b2 SHA-1: e2884dd7f6dbb67b01196f1f2074e60e8e77c9ca SHA-256: 5ec8c669efcd7336fda9a101a7df1111f47de89c7e654b193092fb83ddea3a04
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://huntic.ru/uplcv?utm_term=how+do+i+clean+storage+on+my+phone PDF link annotation
    • https://mk-promotions.com/ckfinder/userfiles/files/53196796138.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/nibamobexawejitivibozosek.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/5eada10a2300e2ddce3713182362881f/jadazij.pdfIn PDF document text
    • http://naoshima-habitant.com/images/blog/file/puzal.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/totetudeb.pdfIn PDF document text
    • http://xn--hh0b97d8is16e.com/userData/board/file/kabaxewololu.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/wefozipabuf.pdfIn PDF document text
    • http://tucsokszekszard.hu/images/news/file/gedevuwisaditumigoxel.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e871d85d6a---65031883541.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/42576750400.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/88400694043.pdfIn PDF document text
    • http://studiopassarotti.it/userfiles/files/48508394172.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/14817196268.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/16550366581.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/54688630015.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f400aa1804---89478585206.pdfIn PDF document text
    • https://soechi.id/userfiles/file/wapinofasumuta.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog/file/46410602550.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/97767658186.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/55580490025.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/60697001579.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/rapoladegebumukewi.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/84559435100.pdfIn PDF document text
    • https://chptravel.ir/data/file/53260047409.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f24ddc74c---38296183565.pdfIn PDF document text
    • 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_off0000e801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE801 18464 bytes
SHA-256: 8eb0085b5e1a93598296684736477f3701d1866fc442b96564745a768e4c5d1c
font_01_sfnt_off000117c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012fdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FDC 11152 bytes
SHA-256: c1a202e52dfcfd0a7dac4ab19272f4af9fed57de4597c81102bf79365b5e0466

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