Malicious PDF — malware analysis report

Static analysis result for SHA-256 127e53fcc88c71a1…

MALICIOUS

PDF

74.7 KB Created: 2021-09-05 19:46:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3fc4cb3c0f1befec258ee6f0b1d8f73a SHA-1: 3615982dde940d74e41cc6e9a8b56d756b4818a0 SHA-256: 127e53fcc88c71a1b52944661573ad52ac4784e3e1533f569a46ac230e816199
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various domains, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of 'utm_term_redirector=True' in some URLs suggests an attempt to obscure the final destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/79299fd43420b98a4a0afbdef5594fd6/zuzujigoseloma.pdf In PDF document text
    • http://carlaschroyen.com/content_docs/tugiwijanogatokivuw.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/lamufuwi.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/81886521780.pdfIn PDF document text
    • http://oembag.com/uploads/files/202108181829496494.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/surewewanusilezop.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/tefojuvuvivufe.pdfIn PDF document text
    • https://melz-feu.ru/upload/12849827593.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/c4889ea96053dadd8d274c5c1bcad798/63994908448.pdfIn PDF document text
    • http://nirmalamathachurch.org/cms_uploads/image/file/purazejogemawufiximopat.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/lemoxevi.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0aedbc928---bapumoxam.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/5468456016.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/4c601ecc5510e8200bceabdfd4372b6b/51638836329.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f38dbd66a06---36820661882.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/ge62oua6kk9bnq13d0r9qvq3ml/27250598111.pdfIn PDF document text
    • https://hostingalani.com/calisma2/files/uploads/gejijevagiwuregim.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/xukimoxisuvaloj.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/murapuxujeditubatumajo.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a15a104eb87---pisapasog.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e6b357940---81668161272.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/49d1d0ed6b1f3a396b410721e5416777/54732207090.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/vijetuvanaruviletamule.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/26243410942.pdfIn PDF document text
    • http://tlproduct.com/userfiles/file/43605163362.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=schneider+overload+relay+manualPDF 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_off0000c198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC198 10724 bytes
SHA-256: 87d2ea4777a1be023c57f40743704d8ad7cb65a956dfad5985e2eb29e5da7d2c
font_01_sfnt_off0000da01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA01 16904 bytes
SHA-256: 937b467aa89209ec368491f52cf5ab2e634b1498655afc3a709b1cd392b83f3a
font_02_sfnt_off000105a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1