Malicious PDF — malware analysis report

Static analysis result for SHA-256 61a062814ebb6248…

MALICIOUS

PDF

80.9 KB Created: 2021-09-03 19:42:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 08d580ee775abc105c67d65709957d2d SHA-1: 60dc788f90a0ad4bcda65f58963624a5b5597883 SHA-256: 61a062814ebb6248089031667b82324ec2e94465881ab6df97aadfbc3b3949a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the nature of the links point towards a phishing or malware distribution scheme disguised as a free download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://allytemp.ru/uplcv?utm_term=mcitp+interview+questions+and+answers+pdf+free+download PDF link annotation
    • http://normel.org/files/upload/file/99821159160.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aab1e079647---22371790422.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/xumonimiwavized.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/pazetofisebajudagotejufa.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/genizawovojevo.pdfIn PDF document text
    • http://nazycakes.com/userfiles/file/vozokakopozusizatoduregox.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/b2bgen4lso6nnnjociilmh34q6/55776952513.pdfIn PDF document text
    • http://eko-uklid.com/files/file/zejokiw.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/gigili.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610a68b876704---befesupegixadifafi.pdfIn PDF document text
    • http://malifer.hu/upload/file/69518727440.pdfIn PDF document text
    • http://mfahk.com/upload/files/16724950113.pdfIn PDF document text
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/c1c7c1cfb735eb1f6a8c08f103f0547e/14036367816.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/fegokone.pdfIn PDF document text
    • http://high-keenltd.com/userfiles/file/xusivujebeja.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/10609152679.pdfIn PDF document text
    • http://netflor.pl/upload/File/83998383696.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/wupunudin.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/78334426842.pdfIn PDF document text
    • http://www.videocopilot.net/assets/public/ckfinder/userfiles/files/48668792369.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021051609281752.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/6d7f0cf067b536f0b532d6836d991aa3/48353962542.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/komoguwozivatafowinekuka.pdfIn PDF document text
    • 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_off0000d740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD740 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF57 11004 bytes
SHA-256: 7e5f46a52aeb393064c89cff3fa963e19d36741892a441c44f52b4baebcccbb7
font_02_sfnt_off000108e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E2 17452 bytes
SHA-256: cdb7573767502743194c90b2b45cb1e7a0316b354b557e314c75c5761e7cee63