Malicious PDF — malware analysis report

Static analysis result for SHA-256 b10429a35914be6c…

MALICIOUS

PDF

74.6 KB Created: 2021-06-13 12:20:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 396691ad471752418db94423c494421c SHA-1: b72df0fd054e255a0849a6edd049b86b55616d7d SHA-256: b10429a35914be6c3fcc723f2c76e187eddb60429b68d902b2fccc07c00916c5
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs pointing to various websites, many of which appear to be hosted on compromised CMS platforms or disposable domains. This structure suggests the document is designed to act as a link farm, likely to distribute phishing content or malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://allytemp.ru/uplcv?utm_term=hentai+shuudengo+capsule+hotel PDF link annotation
    • https://bbmint.com/userfiles/file/jaresurawis.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/51649064ebb5694f3949342f953b67e3/18092977498.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/jh1c7fobli5h23b969gqgs0jte/73947251370.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/mezibubevebevo.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a568ed425a9---53986539165.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ea2d8a7d05---gizuxudalezazoz.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/dd4babe90057a68764d52d5e4727dea5/zibomibizuvugikovivigor.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/b7fa82c618405226b81a8ba52ace5a92/sobuwoxufoxot.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c740e34d37---bewijuzegirufin.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/lkebsoddm25ntvj8mp6bpfhbu9/77214422239.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5b5870d3a---33838325227.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/fc2e7ecafca13beb9a6375b7b6e4b5ea/vudilatovanavujum.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a945d68848a---ruruvurazabagiwukilewov.pdfIn PDF document text
    • https://unosms.us/userfiles/file/55089928795.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/19062267091.pdfIn PDF document text
    • https://okinawa4d.com/contents//files/75693576406.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE845 5200 bytes
SHA-256: e23ac32e5d036518314d4890ea97d0480207499e41f83d12e2b7ec760a508014
font_01_sfnt_off0000f9f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F7 10492 bytes
SHA-256: af1cd236841c3772300b866fe26ccd289786376d9c20ba44db98b941a3f7f944