Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ea10f7868622938…

MALICIOUS

PDF

82.0 KB Created: 2021-09-21 03:34:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9297c300576a7aa00c854d2dee9ab40b SHA-1: 86aefcc3db6e53829434f84cb4fa4977876d11c8 SHA-256: 4ea10f78686229389b6f61a230a44d5a617d2ebda3a2e930ca74d87ca910b3bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to external sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://pasted-radio.de/web/files/38826733921.pdf In PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/febolorolaxapilupe.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/xikozerinogedebedex.pdfIn PDF document text
    • https://stancijanegrin.com/userfiles/file/tetefiw.pdfIn PDF document text
    • https://dreptultau.hotnews.md/upload/userfiles/files/miwudusopusekasiguke.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/67562692401.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/kumudejo.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/fawajod.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/c94795f3685905474afa7ac7baf202fa/62271889812.pdfIn PDF document text
    • http://wmasgroup.com/userfiles/file/12028628069.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/zinikimure.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/53733629160.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e85c8c07f8---2679651829.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/mgg16vf70ga4il1jb1tbhvkhfl/vawarowalibejanoxu.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021091720340465438.pdfIn PDF document text
    • http://esen.life/userfiles/file/99189349018.pdfIn PDF document text
    • http://effekt-film.de/files/file/midokitivelusoviniwo.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/pifisijazipu.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/fadolatefetaguvun.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210916_145024.pdfIn PDF document text
    • http://konditsionery-zheleznodorozhnyi.ru/upload_picture/file/soxekalomuretomupeduwo.pdfIn PDF document text
    • http://tivati.com/uploads/userfiles/file/85286536849.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/72449742040.pdfIn PDF document text
    • https://funke.be/data/file/fubitijavexokapejumidet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=new+android+games+june+2021PDF 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_off0000dc7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7A 11032 bytes
SHA-256: 241d5f5e43a9cae634750b876e0f45bc8e61966364d398c3bf6aaa719baf5efc
font_01_sfnt_off0000f5fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0F 17284 bytes
SHA-256: 0a6112d5cc331576cd20cf2d4e02aee6e8faca4ff23d143eb8cd99c12b8c991e