Malicious PDF — malware analysis report

Static analysis result for SHA-256 37969b3e84653b72…

MALICIOUS

PDF

70.1 KB Created: 2021-07-19 12:01:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a731bdb3c44262a8d992e52ddcc820aa SHA-1: bd6c6c066cbba6308680264ccdf2965e82f9331a SHA-256: 37969b3e84653b72bfd7f82d80efcbe5a970235611de47136b20798a932cb655
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's a phishing lure or a downloader for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://aelma.com/sites/default/userfiles/file/23741970520.pdf In PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4e21072ad---75131420142.pdfIn PDF document text
    • http://whsclass1968.com/clients/f/f8/f849445bb2fb8f42e7c863050dc1ba38/File/sokopowegosejivelokege.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210713_224506.pdfIn PDF document text
    • http://wych123.com/upload/files/murewofazufo.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/0c9bfc49495c0e4db624fa5021cc34e6/30666230204.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/30387264018.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/h50eelr0b0s6hnt5u0vskbf1ri/95745416273.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///panupuzaxo.pdfIn PDF document text
    • http://ruihuitax.com/files/file/17901954640.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/xajunusilimojekugugebol.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160882a6995e2e---mejozejemabafujuxasatilo.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/42652151560.pdfIn PDF document text
    • http://blueyee.com/upload/file/050501066816.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/kazotigoraxeza.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/manoz.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608738af53351---betusobibasaxejim.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/e512ed221b8ce77823bcce5b667fcd1c/didefegidedavetepevo.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160c57fb0e54a3---rijafo.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/gizevuje.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a4bcbb442---92216876171.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/43e82bd879952525259c45d210b596a1/ketoxaf.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3e39333718---34710929330.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160813b5f42f4b---nenopewakobodamoziguz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=wiring+a+fan+with+2+switchesPDF 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_off0000b6d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6D9 10648 bytes
SHA-256: 79e4b635fcc639ca115e3c21cf4910c8d5a72e39eb3b1c2565ed7ea3ba1e9476
font_01_sfnt_off0000cf4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE761 14176 bytes
SHA-256: 9019f7d872e33cc54e94413bf7d358af5d424dd8329eefbf6da863e6854fd4d4

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