Malicious PDF — malware analysis report

Static analysis result for SHA-256 b776fe4073b65447…

MALICIOUS

PDF

74.4 KB Created: 2021-09-21 20:15:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cd4ec924d2b8b22dc82b95b4e4943696 SHA-1: 9f1f2fe02d4a9024b86db1707aad7a7766c02921 SHA-256: b776fe4073b6544730f3beb0d18a89bafc36e86a2301b0f9723fe363cc3f2a27
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by an ML classifier as malicious and contains numerous embedded URLs. Several heuristics indicate it functions as a link farm, with many links pointing to compromised CMS uploads or disposable hosting. The primary purpose appears to be directing users to potentially malicious external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://taigesw.com/upload/files/86976373285.pdf In PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/nibutekel.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/37228710165.pdfIn PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/94096749109.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16141e52010591---8274029004.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/lekepu.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/47069007124.pdfIn PDF document text
    • https://carlock.hu/ckfinder/userfiles/files/borixetifefanazaxeve.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130c5ddc99c9---34180018019.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/dosivunidodofoborudedew.pdfIn PDF document text
    • http://unitez.net/images/newtech/files/lifuviked.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/93439998847.pdfIn PDF document text
    • http://tugrabilgisayar.net/resimler/files/84967923891.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16145f1dc99080---79779026896.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/dumaxoremavituvaluveji.pdfIn PDF document text
    • http://jedwines.com/cmsCart/upload/file/36691888935.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613781bf2d636---xuvofiwemigaxoxativir.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/tiloxilozisofisigosiram.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/vinurewaru.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/5450085022.pdfIn PDF document text
    • http://ativn.com/upload/file/xularar.pdfIn PDF document text
    • http://superlitefan.com/uploads/files/funobowurenedasej.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/54903342159.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/kt9cmpgotmqi15qd2isi4n81j3/nesatezogijorara.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d69ee59bef---pukamirini.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/92709876745.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=telugu+free+movies+online+sitesPDF 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_off0000c2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2A1 16084 bytes
SHA-256: 3660431e888246fc70f862c25c62db164b7a15dab4bbbfc68ea8f66a3666d3ee
font_01_sfnt_off0000ebb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C7 10524 bytes
SHA-256: af580800067342117fe55989a2f2c07eef81b153ba752650eba9fbb6a76de1c5