Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fb3f653b1bdfce7…

MALICIOUS

PDF

104.7 KB Created: 2021-10-06 13:47:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e8ac3a01e4e9e6b545ba0653d19bc45d SHA-1: e03c4a0e46006386116c60fb398d94504327cdfa SHA-256: 9fb3f653b1bdfce783df0e8af173b5eff6f8f0cdc104e3b94ca69c11fbbefb46
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous URLs pointing to disposable hosting and compromised WordPress sites, suggesting a link farm designed to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://krisoc.ru/uplcv?utm_term=pmp+exam+questions+free+download+pdf PDF link annotation
    • http://mamitobe.ru/files/file/52226015857.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/jitolidanedabelipis.pdfIn PDF document text
    • http://zzquansu.cn/d/files/niruvopelojipiviwafav.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/dekodufutonagekubenexa.pdfIn PDF document text
    • http://farashimirooz.com/files/xinab.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/zurutax.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/diber.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/jikijerosif.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f2bc86fa7c---pefogalepudawafazul.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613f21191e657---xazabotadaputir.pdfIn PDF document text
    • http://truhlarstvi-strakonice.cz/files/file/vovale.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/43113858197.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/65501202340.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/26764069585.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e19a8482e6---7557722896.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149a232c18e3---42529194406.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/161524686b98e8---wonakujagosogevasajox.pdfIn PDF document text
    • http://104408017.linker.tw/files/zuxuzo.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/dewaledekubivotaburitumi.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/23450675868.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/pimow.pdfIn PDF document text
    • https://aitalk.vn/upload/files/86364829466.pdfIn PDF document text
    • http://naszemotyle.natura2000.pl/imgturysta/files/2235806464.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210916_DB58665DF3B3C5B4.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012d3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D3D 20684 bytes
SHA-256: 18bcc7b339000b5a8a27f68feb839799c6bf205f83446f43aac0350aec0d41a9
font_01_sfnt_off00016309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16309 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017b20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B20 11096 bytes
SHA-256: 87704d20960af777d1a795fcc0dc6bc73a33ae1fa27e59253cf567da5823d223

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