Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1132b54e0944d62…

MALICIOUS

PDF

89.2 KB Created: 2021-09-05 03:55:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3f602a3dca60581c69cd67428b0e7f7c SHA-1: 1f8a9bf54fe471ca17dc8d771c232fdbeee8b7f0 SHA-256: b1132b54e0944d62b460237366d370dafd1f6477853f65a0beb9e0d8ba055abc
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware delivery. No scripts were extracted, but the presence of external links and the nature of the hosting suggest exploitation of user trust to lead them to a compromised resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://nomylo.ru/uplcv?utm_term=wordly+wise+3000+book+8+lesson+1+pdf PDF link annotation
    • http://tangneylaw.com/admin/images/file/14739755462.pdfIn PDF document text
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/rabepizimawejel.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/941a3d7dd87454fa520808ee825ca203/48834448879.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bae2bd34c1---tiwajuzonotemigolopojatir.pdfIn PDF document text
    • http://thegibbsfamilyreunion.com/clients/d/d9/d929505c7faf6263097cc97620c39d65/File/fulax.pdfIn PDF document text
    • http://asv-solnice.cz/_files/file/14070527704.pdfIn PDF document text
    • http://r2doodles.com/clients/4/4a/4a4ed909dcef54c1e3ec6a0ce1d29f2d/File/kefumowokipuxes.pdfIn PDF document text
    • http://cooper1972.com/clients/b/b4/b451ebb09e7e0345645526f893d9a49e/File/16857053003.pdfIn PDF document text
    • https://iaetindia.com/ckfinder/userfiles/files/2871267667.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5a50f663c0---7494652396.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/moxemevad.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/32947740459.pdfIn PDF document text
    • http://health-bridge.in/upload/file/81699187587.pdfIn PDF document text
    • http://secretinvitation.net/images/files/gemov.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/fuzobalolusuzegeg.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c922de9bd---25894708012.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/87120101566.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/bamepasezolesulivabugipi.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/qt25l0jj5r8lh60svd8hhcrmf3/71472761126.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c739a9872fc7db8710b830e5b5aa2e6d/57726992584.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/bazalefapipidubusur.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/56888733055.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/vggahfg7306s73ee38ouenm30o/95479078932.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_off0000ebf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001040b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040B 11208 bytes
SHA-256: 35b03d6907312b5e9e14bd323d7bc75411fe5fa29a59981dba184dfa868f0275
font_02_sfnt_off00011e43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E43 22528 bytes
SHA-256: a2d223b0ec2987a4d606813961b23ff7980e593c6273db4458059d398a6c337f

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