Malicious PDF — malware analysis report

Static analysis result for SHA-256 44e8918b283d2ed2…

MALICIOUS

PDF

83.2 KB Created: 2021-09-07 05:17:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e5b60fadea2af1105940ea7e9eb314f6 SHA-1: ecb8331a52e2332a14e236b4a1f80256b0ed6411 SHA-256: 44e8918b283d2ed21801496737937cfe2277d5a8269f1fd935712b52da72e957
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to link farms hosted on compromised websites, a common tactic for phishing or distributing malware. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. The presence of multiple distinct hosts and link farms suggests an effort to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e7e70965001---32986118909.pdf In PDF document text
    • http://sarljarry.fr/userfiles/file/samufevatopotilitam.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/67003d9d18eb4a92b9d322b9054cc46a/42140122110.pdfIn PDF document text
    • https://unosms.us/userfiles/file/73446275379.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607035f91d3be---91986033705.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160960a8b82e57---45297437157.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/3ac2aefff13838b605e8a94868be9574/xonizofupakesoganiz.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/e1d1cf1e8pisrn951s0ausfib3/32889847272.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16073cc98cb256---biliwefo.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/buvaxonefujunikakoviloxav.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/sogerinaxegapexi.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/tovosojolifuzadov.pdfIn PDF document text
    • https://kaptenhoki.com/contents//files/3004249482.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/80661841652.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/98488722900.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607538fce344d---tofirazidor.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f63c181ee---tobovitosedevarolo.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/12197750347.pdfIn PDF document text
    • http://armanetti.com/images/4177978282.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/2uee0v8rgj94v5q056ktnhlrv5/kegapifimirasotum.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/3821462486.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/gugirob.pdfIn PDF document text
    • http://yves-segers.be/userfiles/files/rofupabatigelarakozem.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/xufasoxoro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=types+of+risk+management+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_off0000df76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF76 10964 bytes
SHA-256: 199fd1ea5a0ba748baebdccb7f384ab708606cda206910191c48735e3276fc7a
font_01_sfnt_off0000f8bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BF 17944 bytes
SHA-256: 4fdf63a6a53d3544b647c53346e2ce6f971a3711e51d7fb2c09a7d2b0554d7fe
font_02_sfnt_off000126e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1