Malicious PDF — malware analysis report

Static analysis result for SHA-256 f988956a51a3cbd5…

MALICIOUS

PDF

86.0 KB Created: 2021-09-21 08:22:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d2aef0e8222a0aad47f960e7ae1e06b8 SHA-1: 49cee493bd780f896847145a3cb2ff6fd6c0a64b SHA-256: f988956a51a3cbd5ce96a935fda43bc79cf145492de467d04e24fefce0973f41
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to compromised websites and disposable hosting, suggesting a link farm designed to distribute malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern. No scripts were extracted, but the overall structure and URL findings point to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://aldea.work/wp-content/plugins/super-forms/uploads/php/files/cdd6027dbfd38cfe838d307d525829eb/xefonazogebujuvumog.pdf In PDF document text
    • http://puebloexec.com/userfiles/file/gobavumamivowuvutumojif.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/zoxeluza.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c042e360d1---71264010645.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/konugadipopolosiforipi.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/98596070922.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/wilobopoxuxopa.pdfIn PDF document text
    • http://nofatrans-int.com/userfiles/file/weraresugagesun.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/2160284782.pdfIn PDF document text
    • https://nidi.mk/ckfinder/userfiles/files/venekakirefe.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202109021014065771.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/48688872754.pdfIn PDF document text
    • https://emtracing.net/userfiles/file/39662434218.pdfIn PDF document text
    • https://eric-parnes.shortex.com/ckfinder/userfiles/files/xajubowevadobabovin.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021091303165785.pdfIn PDF document text
    • https://rivieresoceanie.com/userfiles/file/15569290550.pdfIn PDF document text
    • https://cultureresortpokhara.com/assets/userfiles/files/63486939375.pdfIn PDF document text
    • http://zapatosperezcabrera.com/ckfinder/userfiles/files/najituv.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/2143025591613a7b1657417.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/dezuwofumilunuwonamiga.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/geruxisuku.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/wutezapolukenodazo.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/cd4rgnc5unfi8kop8g51noq113/nunadevigafug.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/mevus.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/pinuxobaxa.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614370ae5a9fd---lusifekulalozusuwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=wallpaper+mobile+samsung+galaxy+acePDF 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_off0000ea27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA27 11068 bytes
SHA-256: 8aadeffcdcf319aaea4db874ba4155508336fb2bcf8fe04a180ac8888166e53c
font_01_sfnt_off000103b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B6 17832 bytes
SHA-256: 8e17485785e1ec2efbe9cfbbe090eab90b969f723917a9645a657d78bd6e28a0
font_02_sfnt_off0001326c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1326C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.