Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa8c011ca2448b22…

MALICIOUS

PDF

75.8 KB Created: 2021-10-16 09:50:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d6e1879a9cc4c981f712d3ebf9cbadd2 SHA-1: ebc9924e5f49f451542eb8f17118f8b3d93c34aa SHA-256: aa8c011ca2448b22b6f0af5d8cee8113c61949ed7f7c1f4ba64a4815c7ab1d91
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The presence of an embedded JavaScript stream further suggests malicious intent, likely to execute further actions or redirect the user. The ML classifier and ClamAV detection strongly support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ikuma-car.com/js/upload/files/84893137305.pdf In PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/36970933053.pdfIn PDF document text
    • http://space-edge.com/upload/files/jupibe.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-10-13/20211013031444807274.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/2681cb38555fb97ebdc7a2c46b5be5bc/50209304672.pdfIn PDF document text
    • http://sky1981.com/asset/uploads/files/22600311990.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/45625494826.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/9susimqmu4542gv61nqmdqh016/43576064542.pdfIn PDF document text
    • https://samsungklimamodelleri.com/upload/ckfinder/files/rokudoj.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16131d42f5130d---92827821075.pdfIn PDF document text
    • http://exosushi.com/uploads/files/11986515793.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/161487710caae6---45019710082.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/lewesafa.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/93538440320.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/70513001869.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/26076495559.pdfIn PDF document text
    • http://casaperugia.fr/userfiles/file/wijaguvuvubuwi.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/sugusututojutugawufikanim.pdfIn PDF document text
    • http://globalone-mould.com/gbw/fckfiles/20210930235239.pdfIn PDF document text
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20211004024512.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/bavuwurodorigixefozixa.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/fidexaleberazozel.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/vatagulomi.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/giregamixopunazokatitimok.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/8781156749.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/1hHberoKktI/uplcv?utm_term=list+of+people+to+pray+forPDF 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_off0000c705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC705 16804 bytes
SHA-256: 6f9122b232737c7a44fb93b32952fb57481c2a613645b537970922f74b13194a
font_01_sfnt_off0000f236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF236 10320 bytes
SHA-256: d276526c7a0ea1e9601c380c2381e839e20d2025e14461c4c5541dfe53ba27f9
font_02_sfnt_off000109aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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