Malicious PDF — malware analysis report

Static analysis result for SHA-256 e372f8ed010b0ac6…

MALICIOUS

PDF

81.4 KB Created: 2021-09-11 07:36:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9fadd9800cb71cdf3191a194f244382d SHA-1: 2fbaeeea2a2839ebc1f2e0409cf442a05bc45bc4 SHA-256: e372f8ed010b0ac6a4bd7ba1857c55dda4e678969685d7b93c5f000af3ee6a23
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It functions as a link farm, directing users to various compromised WordPress sites and disposable hosting domains, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure and numerous embedded URLs suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://archism.ru/uplcv?utm_term=how+to+record+android+screen+on+pc PDF link annotation
    • https://kodcomputers.ro/2664/uploads/65759395520.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/kaxal.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/genunibawejinevadiva.pdfIn PDF document text
    • http://dichvumucin.com/upload/ckupload/files/wazodiwikowosimepeveb.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/6t7t4aardl26rdnc6pstr01ehe/34830025815.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/49733432584.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/gubixiw.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/tivexo.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/55043520513.pdfIn PDF document text
    • https://ms2oke.com/contents/files/xitaruwanipi.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/36767694446.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/13093727166.pdfIn PDF document text
    • https://robustbrakes.com/administrator/imagetemp/file/xovukuwibavapix.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com/app/webroot/uploads/ckuploads/files/wenagej.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/67190241144.pdfIn PDF document text
    • http://dautuck.com/uploads/userfiles/file/99548172250.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/fasiwaf.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613993261bd63---lepuw.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/medufuguwuzepagozolunido.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/nipibavuvowevoraginagefa.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/161340af39d96b---72409985333.pdfIn PDF document text
    • https://digireg.gr/upload/84145995215.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/benumazasome.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/59456266925.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_off0000da17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA17 17900 bytes
SHA-256: 931ba87f405db20665ef38a551efd98e407fbaca1efa35ef849ce4c0c46db11c
font_01_sfnt_off00010804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10804 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001201b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1201B 10536 bytes
SHA-256: f106f8fda5716148017f80d08da7625c852802a90f8bd44a2593458c88111a81