Malicious PDF — malware analysis report

Static analysis result for SHA-256 51888acbf45c2e92…

MALICIOUS

PDF

96.0 KB Created: 2021-09-04 03:34:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b9764b28cd15ff18ad32850dfb8b7bae SHA-1: 44daaed04f51280dd23236d8f9a3e5fe95ca48b8 SHA-256: 51888acbf45c2e9222553c7d6ee06e410adc03c90bc7aac6aa4cbf0d7f632a02
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URI links and link farms indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/fa8228155767224d1f941704ae04f2ad/gunapide.pdf In PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/2fe2tcahe3l1cfg4bi6gb5pr4f/86074181470.pdfIn PDF document text
    • http://hyeminshop.com/DATA/files/saxizasutesipobov.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/90022ea6288d5d899f307391d2f1f6cc/fakavogubadupuperukuzerel.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/robofasukipubamivirar.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210904040939.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a1d92f5ef---25003692080.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/moboxulipowir.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/84590791650.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/milemezigogabotoge.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16106f3c1d873d---basetitikapov.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/95488869192.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c74b5cfc36---zadinajenevuvawupaxepulo.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/rewironiruzupemasupupe.pdfIn PDF document text
    • http://willbramephotography.com/rusotituxububeba.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/jizojopuposoweri.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/a9e7bd6691dabded4037b9511c4b257d/fefiwujikur.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/vodoxipuwavetifomope.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/8k2e01fqpfb2ov6rlrg6nof32o/mozusorijoxumuwawetuveba.pdfIn PDF document text
    • http://dhsclassof70.com/clients/d/d1/d13f49183e6b2ef720c1f353b43de0f2/File/divemoj.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/46277060678.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/kowimadefalogipudera.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/aaa28723ab271fbdf174a042a2236f78/kesesodokijekixok.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161126f955c54e---domonitavonefinomeramak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=optical+modulators+pdfPDF 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_off000111f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F7 18708 bytes
SHA-256: e3ceebf3adcc2f0d4b58b50801379cae485ac854d4399c3e94b0a2b8bf22c3ff
font_01_sfnt_off0001420c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1420C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015a23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A23 10672 bytes
SHA-256: 63768a09150040f20d9312c2fc4d69e92f748ef596531832565f50cf10f8c7c0

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