Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d9499c327bc0cfc…

MALICIOUS

PDF

72.3 KB Created: 2021-09-11 21:16:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c973b8ec105d532e158c0462507b7535 SHA-1: 4d12cef68e662f3c6e97bf978c5cfde7d915021c SHA-256: 3d9499c327bc0cfcaec3bc68cdaf19686879861dba3014ead40b8575ef50498b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. The document contains numerous links pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and link farms indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://smidgel.ru/uplcv?utm_term=covet+fashion+download PDF link annotation
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/161333432a1a57---bidaxinuje.pdfIn PDF document text
    • http://nensi.si/upload/file/49964862490.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///boneporene.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613398f6bffb5---40488354679.pdfIn PDF document text
    • https://mgc.to/sites/web/upload/files/71728089616.pdfIn PDF document text
    • https://groupekineconcept.com/userfiles/file/34789320662.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/8896034787.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/nasudozafedeko.pdfIn PDF document text
    • https://radio-clipa.ro/userfiles/file/gakupebo.pdfIn PDF document text
    • http://noithatphathuy.com/Images_upload/files/vegazimofilutodoxa.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311390b115f---revawiroxudesojafiwe.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/77509177749.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/6159933159.pdfIn PDF document text
    • http://linza-market.ru/upload/files/mepobaragenir.pdfIn PDF document text
    • http://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/73128920260.pdfIn PDF document text
    • http://tongrentangthai.com/UserFiles/file/8339189040.pdfIn PDF document text
    • http://daehnfeldt.com/userfiles/file/75779938586.pdfIn PDF document text
    • https://shibbirs.com/media/files/8741504663.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7cf0dc3ae---kasetexefobaxijavapavum.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/jegepekinetuvuweruxes.pdfIn PDF document text
    • http://delta-serwis.pl/pliki/fodiziniz.pdfIn PDF document text
    • http://workontext.ru/media/file/41147292792.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/34285128128.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_off0000ba47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA47 10536 bytes
SHA-256: c79479530e55d116365f9273a349662f9717adc87dc00e473a314f37338f2feb
font_01_sfnt_off0000d256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD256 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA68 16096 bytes
SHA-256: 25486b43e52d716db12d672125b1cf161a56482e081267cd112ce4b86c90b92a