Malicious PDF — malware analysis report

Static analysis result for SHA-256 44f92640ec2aac0c…

MALICIOUS

PDF

73.0 KB Created: 2021-09-02 13:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6f9e8f166e9faf05e9a5f45990f23054 SHA-1: 4746350832f3773d3db1955d950e00d8c859e1d7 SHA-256: 44f92640ec2aac0cbd24e8ddaa9744d9ea8ffc44a0985294f32dcbcc1e06ae2d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm hosted on multiple compromised websites, directing users to download further files. The ML classifier strongly indicated maliciousness, and the presence of numerous links to potentially malicious PDF files suggests an attempt to distribute malware or facilitate phishing. No scripts were extracted, but the overall structure points to a downloader or redirector attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/2f48502e2a1c8cad6e3d4d2546ac70ba/82425298212.pdf In PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160905ae0403e5---keduwa.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-8-12/20210812020747532031.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/97573d51cb54259f327a374d9faac79b/63558508215.pdfIn PDF document text
    • https://0924055971.com/uploads/files/202108190219506539.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/bikinegijovozibi.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/72232510280.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a657335c33---xorotebegediwiwakabejaxep.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609866c13bfb8---70934411325.pdfIn PDF document text
    • http://debeight.net/UserFiles/File/64101334269.pdfIn PDF document text
    • https://traicaygiasi.com/Images_upload/files/dadamanumumulivaxumutet.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/t6br28j1tdnsui8iq48a84vfs3/25454273708.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/56662982640.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/weruveto.pdfIn PDF document text
    • http://focostrade.com/files/20210612072551.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd243ebb4ad.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/48682216002.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/84855204886.pdfIn PDF document text
    • http://singlesync.com/userfiles/file/14359999401.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160911c6af1b78---gubedesonaravezibodawiwo.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/cnjrcej72la59sr9jkt3dqolc6/wozufivurujegapejo.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/xapilepumiwenogo.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/45508403119.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aca159bd881---74454498267.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=rscit+paper+8+september+2019+pdf+downloadPDF 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_off0000b5af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5AF 16712 bytes
SHA-256: aeb969cc4b571bd1c6ed576799569dd411ae35a6c03a6ada4439118802cc1880
font_01_sfnt_off0000e044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE044 11724 bytes
SHA-256: 1021ba4b0be6570e7b4a6d061ac3c7d9ee00d2cdd4d7c3c571306f5044bf6e6f
font_02_sfnt_off0000fc2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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