Malicious PDF — malware analysis report

Static analysis result for SHA-256 d34360eb1358f402…

MALICIOUS

PDF

132.0 KB Created: 2021-09-03 05:58:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 08f515421d9d40766491bd11b0db85e8 SHA-1: 56c2e5244ebd1efbf52b88f7a30bbcd1b9f36bc7 SHA-256: d34360eb1358f40207cadbb27f29bc4f774b8c30e481719094687e0d309bbada
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://dishandspoonproductions.com/ckfinder/userfiles/files/rusarupumigiwu.pdf In PDF document text
    • http://dharmapremipariwar.org/userfiles/file/66178086141.pdfIn PDF document text
    • http://cloverdiamond.com/file/xedizedologisakun.pdfIn PDF document text
    • http://ellev.fr/upload/files/rigapodenup.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/8748828851.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16072b3468bd5c---nidemepenin.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/12899123143.pdfIn PDF document text
    • http://aid-calais.com/userfiles/file/wasekejewedo.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/75506718433.pdfIn PDF document text
    • http://pandoreunion.com/clients/81456/File/50065080419.pdfIn PDF document text
    • http://hondaotohaiphong.vn/upload/files/taxawedeji.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/bn8h24d2mjm0eupp3a1e0hn2nf/21584756418.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/2kpheuqe2hvq0p55clau5jhu30/75187470923.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/41370859874.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/64591627882.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/3b92aca5f6dda303051b8e26a4b82594/19430192903.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160741edaea137---55141152208.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160f6f72b080ab---kepaxukewejibejekebasuvu.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/909798562b8860ecce7c559209ffbe86/98674465799.pdfIn PDF document text
    • https://expomediainc.com/upload/file/45840150241.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/0c296c0892726225ea2fbe9f7342cd35/81217257264.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=dimensionnement+definition+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_off00019af2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19AF2 10352 bytes
SHA-256: 868c222438074bfda6d59984507421bcb3dbd1894322b8167cb5e127eb9e8c6c
font_01_sfnt_off0001b24b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B24B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001ca5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CA5D 20688 bytes
SHA-256: 3d81c4805580905fdc8f127061ae5ed7545f422400be6fe196592335b27dcc10