Malicious PDF — malware analysis report

Static analysis result for SHA-256 955936b9dfe99305…

MALICIOUS

PDF

99.4 KB Created: 2021-07-07 09:20:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9a8ef2bd10746d40573ae5e65aec1b9b SHA-1: e5299225c314a26d0a3c0dc24f2af327d83551c7 SHA-256: 955936b9dfe99305ad196a3b65163ba66d72e5bb9e8d3d5cda7c283fcc449c77
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and PDF heuristics strongly indicate maliciousness. The document contains a link farm pointing to multiple compromised WordPress sites, which in turn host PDF files. These PDFs are likely designed to exploit vulnerabilities or trick users into downloading further malicious content. No scripts were extracted, but the overall pattern suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://invest.pl/userfiles/file/ganude.pdf In PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/sbgbg997219mop7bo1viid2090/14450977551.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/c5532ea17d75eef552391286900b4348/woguwefotanotaxor.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/0c4d7feb90c6e8321d5c597a62b76645/24525642405.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/l18v4hlp801l3prtqlr488qq5g/dapirufobogutanemawib.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609db359df6ed---13526729633.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/2d7cb1fdc4779c15b4c587647a389aea/sawofasupa.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/puzijojefedug.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/77052849916.pdfIn PDF document text
    • http://cochu.net/resimler/files/jekalatujegirirurituz.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/solaxijodutozixexizi.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/frvlt1rb08j1c012d0ik03ma4f/vozaboserorikuwenoret.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/85709986569.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc272c3b02---99732530218.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/juperewuzunofepurez.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f2c5eb5ab---1514205251.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9177b671d---fexebupaloduzimitogidudob.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/dugun.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dugunituwi.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/bemisi.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/8f04bfdf7ac95541425d9fbc93b8dae3/pulixexagewozaroso.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/31806c9efed517dbc7b530e3805ceb2e/64144453073.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b180fb3edc---30096292295.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=staad+pro+learning+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_off00012265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12265 17124 bytes
SHA-256: 3e450fd6edee33a0628cb8868d41f6230d5a78dfab5bb4e2cfb4696b6d3dcaef
font_01_sfnt_off00014efd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16714 10580 bytes
SHA-256: e6aab61e3e9ad77f6bec3df9c7278ca21d57d6d88bc0d411d20b7890bd9a9b09

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