Malicious PDF — malware analysis report

Static analysis result for SHA-256 882e9930a888c5a0…

MALICIOUS

PDF

76.2 KB Created: 2021-09-02 21:09:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 02a1f367a3eb6fc18d44945671317809 SHA-1: 4e13a6d0dcef5234c3852f3ff4d013ee5b5f9bb0 SHA-256: 882e9930a888c5a0705b5ea04760698fb5d8f3208e1b122816e1b3c77df8ae9d
94 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm. The ML classifier also flagged the PDF as malicious. While no scripts were extracted, the structure and embedded URLs suggest an attempt to lure users to potentially malicious or SEO-abused content, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7511

Heuristics 4

  • 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
  • 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://popmetre.com/news/files/33346417227.pdf In PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609867669c766---waxedutudu.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609c94ed040d9---lujodoja.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/pgejjnnv1mri5q3obnloa8v00j/79662434592.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/nesotu.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/giwigasabufojem.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1607da794340ea---vuxuragam.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/a43874d8a9de887109b3fdb4882d53e0/mosatawi.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b7d8dfa63---12614043195.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/gubeputerexiruwejesus.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/lonuvawapowimo.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/72672089773.pdfIn PDF document text
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/litetoxopimutoxep.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/38420666953.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/gedanuzodejoxizeripixisev.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/rogimovewilufulogare.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/30022777572.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/djsldb4lrdetq6t8ahcs4pu2dt/19230032482.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/pagaguzuwafixavijukijuse.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/59634526993.pdfIn PDF document text
    • http://buchtel1967.com/clients/26382/File/26059448243.pdfIn PDF document text
    • http://varanini.pl/userfiles/file/xafosodosedemamekaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=moteur+asynchrone+triphas%C3%A9+cours+sch%C3%A9ma+pdfPDF link annotation
    • https://www.thc.gda.pl/ckfinder/userfiles/files/23790195858.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B9 11200 bytes
SHA-256: f4350631584b1e223a837fb685e0113cc664c21449d79342e78090f583d0f428
font_01_sfnt_off0000fe78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE78 19412 bytes
SHA-256: 387dbdebb7448fa5b6c568aceb76bfb27f8e86274cb99b9e886238b785751c63

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