Malicious PDF — malware analysis report

Static analysis result for SHA-256 8133efd531d92807…

MALICIOUS

PDF

92.6 KB Created: 2021-08-09 01:42:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 8e303b2022599bed3b6a2e67acae4cbd SHA-1: e51424ab7a9b38b6975900acac517731d1c6267c SHA-256: 8133efd531d92807da4ebc7cd1a922a67cb8b8b1a2b18cb02dc7ef1f6debd94d
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised CMS upload storage, suggesting it functions as a link farm. The presence of these links and the overall structure point towards a phishing or SEO manipulation attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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=walking+dead+road+to+survival+free+character+codes PDF link annotation
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f50991b4605---zijufizoxisak.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12218467489.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160871dba66bd4---lelakitefig.pdfIn PDF document text
    • http://lse.hu/userfiles/file/kivanapawedavazeligutoti.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/15042209016.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/74348061217.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607026cf43508---74712072713.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/giwetimer.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b89b2a550b3---36512555811.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/26939162312.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/bunarezibijanizaj.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4869b3ba0---64740320687.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/dipafapadivazotupunufat.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/2a4057f93604ac0b3f9eb64cc6e8a7f3/34487988537.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/2fcd781989458423f4c21b40e35ccc0b/27866206917.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160850cc33c580---50760051513.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/rorim.pdfIn PDF document text
    • http://jpcadonate.com/clients/4/48/4863a0bac697dd4b44f4a1b1fb44835f/File/17241783584.pdfIn PDF document text
    • http://adamshs-pdx.com/clients/d/d3/d3c120c733f7363e2cdaef2cff5f3687/File/74547841196.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/7799063535.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/lononatevuzivupelopu.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/bupukazuzididuz.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f51673ad186---sagubokuwevesalaxewixo.pdfIn PDF document text
    • http://fotossc.pl/_files/file/xewane.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c1de7ab5ff2---88537016223.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/8m34987jdnibl525m35cd8engi/73541522243.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17C 17912 bytes
SHA-256: 8265e6ed18d278ff769bba1a67091280b14d779eb8591268374d1c677d623733
font_01_sfnt_off00012037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12037 16160 bytes
SHA-256: 27fa49ca30b1f57c6e4f8b99ad1f73ead7010ce1f191e20d716503af09158f46
font_02_sfnt_off000135b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135B1 11008 bytes
SHA-256: c723d94fdf15d9339a0aea70b80da9ce2977a4d4da8f3a669794b9d45e26f862
font_03_sfnt_off00014f0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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