Malicious PDF — malware analysis report

Static analysis result for SHA-256 1932ff317acf24e8…

MALICIOUS

PDF

87.5 KB Created: 2021-09-06 14:38:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4731b7cebc02cf4e74e27b76a1ee49a3 SHA-1: a2baeac593df57e6873bd8ecc0a40b9300b7b8d2 SHA-256: 1932ff317acf24e8c2dfa37d3cf62381bc703f73f9ed39f9eb294e7728328b40
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and link farm heuristics strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • 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.
  • 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://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/gojokidupixazan.pdf In PDF document text
    • https://drisraadentalcenter.com/userfiles/file/58995473678.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/26163018905.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/kakokewezefodiruzese.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/redipireze.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/58261395232.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/26562062769.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/12cf4a0aff6e4d712a1b7524485c0987/71752430718.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/vuvewonen.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773943dad99---tafaxegapasoj.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/taselerefemos.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/jibuvijebumami.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/42232702412.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/fea5442a4bfc3416aa4814e47d7db48b/18496404267.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/b9519763cd71a4fb78f46086af4556c9/75554057263.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/37426209136.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-8-15/20210815210659201908.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/91065103991.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/22851058925.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/57074317290.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d593f62038---bonimelumovulojojafarapaw.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/5098503211.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/mubknli8lljmierufufqmsk08m/99745600406.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/dosevilulejovajevokobona.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/733427625e738fcde419bc98d14f3935/83057329659.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16085011d8f018---vakamexugiwipibebisoputub.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/68316853579.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=spytec+gl300+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_off0000eec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DB 17992 bytes
SHA-256: 60ad5c74253c66be648b14e84883bf543f28057c2212bef6483fa0b1c3af122e
font_02_sfnt_off000135de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135DE 11088 bytes
SHA-256: edf37b5723400abbce89217065e0849869c034a71a2ac305faeabca3970d8f62

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