Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb81fe4432c87535…

MALICIOUS

PDF

82.3 KB Created: 2021-08-18 16:54:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 55699805d6bba0142566babad1925687 SHA-1: 5973d797e7108c9f2760dc74c155c2a1faad8c96 SHA-256: fb81fe4432c875353efebfee425bec606947a7c3479f52456656e43c7f55935d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=freemake+video+converter+keygen+free+download PDF link annotation
    • http://dges.in/userfiles/file/galug.pdfIn PDF document text
    • http://bronia.org/userfiles/file/36951183144.pdfIn PDF document text
    • https://zakarpattya-tour.com/upload/41666548685.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/59901450389.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d10f82510---regetamuwedabewevab.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/181487caba84d22ea8e3498de6eb7b38/19838084561.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/34db3a3e860ae9f44516cc608e0c1a45/fupisumitid.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/bufukiximapa.pdfIn PDF document text
    • http://kalikraft.com/images/file/26514093174.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d1b82198ae---nosivuwunebepodesokelu.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/9d1c094bacfe351071f3729773fd8bbe/5244388650.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088bbabd3b8f---darumupuvox.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16098866736e50---55336219904.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/gisasiziguga.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4ce8b245254551eb3fc6c8a529798fc0/dimiba.pdfIn PDF document text
    • http://abnicum.com/files/file/vugawinogiwiderex.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/nopijefejekumajaxenude.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16102da46c4ba2---41721475632.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd4abb6748---1577349593.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/30394806071.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e459b3d51---gopusakijit.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/84b5db2a728196b942ca42a4fe2bd864/xogav.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1D 10988 bytes
SHA-256: 52658e272c1cf886e64d96345a51ca97120897e848972506ae4e7cef239ffdd2
font_01_sfnt_off0000f66e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66E 16884 bytes
SHA-256: fee7ba34cd8ad3f6915d2cb1d4e594af83d0aef7186984a854cb93bb0495cbf3
font_02_sfnt_off00012272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12272 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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