Malicious PDF — malware analysis report

Static analysis result for SHA-256 1759d935cf656fda…

MALICIOUS

PDF

74.9 KB Created: 2021-09-17 10:23:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9ca4e01eedde4b47d621351461dc4765 SHA-1: 75744d25d47d5dd192dffbbbd69902eb23adc4a9 SHA-256: 1759d935cf656fda3289abfd430c230a8c94b5dcd7a83a1454f7a0235ddb06d8
136 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier strongly indicated maliciousness, and heuristics identified the document as a link farm and potentially containing command execution tokens. While no scripts were directly extracted, the nature of the URLs and the heuristic firings suggest a multi-stage attack, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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=hello+neighbor+apk+para+android PDF link annotation
    • http://anaminfo.com/attachfile/file/45569690473.pdfIn PDF document text
    • http://xn--elementy-zczne-kwb98g.pl/media/file/47888421303.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/322361665.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/tixelutinaganejuliwuvim.pdfIn PDF document text
    • http://lex.tj/img/file/64530170540.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/ossdc4goovojubjoebtaldaub7/27343850352.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/62688966746.pdfIn PDF document text
    • http://afslab.asia/upload/files/62836032828.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/gadijuwesomibobulikijo.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/vifom.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-13/20210913132644341019.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/17300897459.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/vemibaredewarofafekig.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/vanutisesozuvojuxifiju.pdfIn PDF document text
    • https://horkolas-gatlas.hu/ufiles/file/45260009910.pdfIn PDF document text
    • https://cyc-catering.pe/disac/userfiles/file/16322286505.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/46322964126.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/71274596.pdfIn PDF document text
    • https://vzglavniki.net/data/file/56549406041.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109020617513341.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/kawewavu.pdfIn PDF document text
    • http://indemo.pl/Image/files/tajenebanaratujafufoze.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/p0d2cmdu40b41n5m6nptkmeql4/rozawakezawex.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/97867290916.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613323c70e7b6---vivosukuribifol.pdfIn PDF document text
    • http://studiotecnicIn macro / runtime command snippet
    • 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_off0000c3e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3E9 16412 bytes
SHA-256: 81cd67708dc71cfd0817b8f0d6d7c18a4cef42a113d43843547357c17f1d170b
font_01_sfnt_off0000ee15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001062c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062C 10628 bytes
SHA-256: 7e82aebc58fb6b90fc22ac89822b8989bbb46ee22a309b1aded6769ba18cf67a

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