Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4f97771cb9ba71a…

MALICIOUS

PDF

77.1 KB Created: 2021-09-03 14:55:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8df1e9a5d1d604cc5f540cdc5c8c0c31 SHA-1: d4edc12288049e0cbd34316776d0bb2243d51c0b SHA-256: b4f97771cb9ba71a7e5e364ecd47a79ff4442c11592c3ae725c29ef8ca2f109c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm. The presence of embedded URLs and the PDF structure strongly suggest an attempt to redirect users to malicious or phishing sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://nnt52.ru/userfiles/file/11534350285.pdf In PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160d8d86720ac1---rapavijiwigimenogi.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160d52f6f39894---lesovididafan.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dec673bd072---mufizeg.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608006dec746a---netowuposufolajifolu.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/61618873584.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202108190430536667.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/nenofitezemipomewafa.pdfIn PDF document text
    • http://freeware-software-download.de/uploads/editor/file/puluwasowavuxigubo.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a79e295549a---noxikikavulimiliveke.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844dfaa3d8e---bubugomilipoguviruxap.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/punibuvakitowiwumo.pdfIn PDF document text
    • http://tehla.eu/userfiles/file/85879184673.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/43450479351.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/xexizimulupotizew.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6742d81c74---23252763256.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/4144a0eee180b1fe319d6970c8c8c750/20656241180.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/62303829309.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/59588910932.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c15002a8c3e---42530964675.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/76255410286.pdfIn PDF document text
    • https://tanthuantelecom.com/upload/fck/file/zatenitaso.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/4e04a72cf449b8e08a0ffb711a0e037f/96445784080.pdfIn PDF document text
    • http://biosite.ru/images/news/file/58868526784.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=leica+disto+d3+user+manualPDF 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_off0000c25d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC25D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6F 20532 bytes
SHA-256: 3be8ea3f8a80a719644092f4c44054cbffb92b6e2a01e3772d09cdd251b75466
font_02_sfnt_off00010f9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9A 10760 bytes
SHA-256: 5014b177ecf173e1347fa17d8e053281422962682447a699e36daf0bcfd43ed7

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