Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd5ee4eacb8e0edf…

MALICIOUS

PDF

83.8 KB Created: 2021-09-01 10:02:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 225f5a759f21aa699b2931026651caf6 SHA-1: a224f1338116a03e4983fc6dbaf85239c552b09b SHA-256: dd5ee4eacb8e0edf08c064d4d67d18d2e6c31aa1739fdc0524c4bd9d5691e794
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The PDF structure and URL patterns are consistent with a malicious document used as an initial vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://himalayanthailand.com/image/upload/File/jazisegu.pdf In PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c12c6dae02c71dcb7248c351cb33b004/sokez.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/k8pslqnbsivgqa3rlj4ol0fsq0/88087069834.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/91138157854.pdfIn PDF document text
    • http://hamdard.com/hamdard/app/webroot/img/ckfinder/userfiles/files/pitomomunuka.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/0dd20fc7029772c67b9530e4237ccdeb/68024958123.pdfIn PDF document text
    • http://indovinandoilmondo.it/themes/userfiles//files/71047770893.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/47d28bf84f685732feba94976a764345/tinekova.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/94435369608.pdfIn PDF document text
    • http://fluidearthconcrete.com/userfiles/file/porosuwebunoto.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/48498614203.pdfIn PDF document text
    • https://viettrungson.com/media//Files/31468364609.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/bhs3o6oaejorhicm3iv5gfp24g/gotemazoxonurasalir.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a18de800f87---xivetoriserajunifomoron.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/aeb0674dfaa142f999feccdddb13891b/53792097641.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/rebewosilemibusavetixus.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/42501324842.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d6c44c82232---25078716648.pdfIn PDF document text
    • http://tw-echen.com/uploads/files/202108241953502959.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/nugusajupobemufusafo.pdfIn PDF document text
    • https://drlanda.hu/user/file/23438739730.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/55facf4a86ee454d7e0db5ec7ea900eb/gupaxuwifazuvawikibedu.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609120962f714---buserevufoxuzu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=healthcare+domain+testing+interview+questions+answersPDF 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_off0000e005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE005 11204 bytes
SHA-256: 9f8306b9924247a27c5737a966ae39a94856344ef16ad8ad4c69f15346a3e420
font_01_sfnt_off0000f990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF990 18156 bytes
SHA-256: 37b584fc4ed0025fad5868b2736ccacc6e2511abab7535bc4bdaa1ac006c7904
font_02_sfnt_off00012837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12837 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1