Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e41998aaf2f8bad…

MALICIOUS

PDF

99.4 KB Created: 2021-09-06 21:17:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ff9044ee94d22cd37157d622a4bf3c4e SHA-1: 8f36bbd4e959d08edd170308a9858ee36e48ea3a SHA-256: 5e41998aaf2f8bad96146aedfd10ca19fb07db9c461a04ca4bb1e03457da40c9
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains numerous embedded URLs, many of which point to compromised websites or link farms, suggesting an intent to redirect users to malicious content. The heuristic firings indicate a link farm strategy, with some links hosted on compromised CMS uploads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://orchid-daikanyama.com/userfiles/file/94913018678.pdf In PDF document text
    • https://anmoul.com/userfiles/file/ribixejusegeg.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/lipekokobejuvebopa.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088628387191---11045757903.pdfIn PDF document text
    • http://bjallstar.com/upload/file/sizuxejope.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/66175989164.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/kubuxul.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210717225852_prrog1.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/1ede01fbf30368fcd46389d4b2e9d52c/67463701147.pdfIn PDF document text
    • http://goforthegreengolfpools.com/userfiles/file/6419906043.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/kutidudaragodi.pdfIn PDF document text
    • http://chinocorporatechallenge.com/clients/6216/File/rukedasavapamikemifapawa.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/82404840529.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/fs9ehq0g5ibfb92qlge1373nkt/powalufuwubawerarolezedu.pdfIn PDF document text
    • http://thanhtindesign.vn/uploads/image/files/veluteza.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/80218224251.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a684b7cff2e---63103354373.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/4adb9d2bf12ec0517dc4049112dc3c03/bulikiludunefenavagetigi.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/34540263641.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/giruxekavip.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/bffb03064e45d4bcd943d3b934be6690/13847027666.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/nokadagaxeruvol.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/7708d72339afc3125f2793bec76380b9/piduduzuzanenegug.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6beb36a343---fabigubutebakunomefam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=healing+back+pain+mind+body+connection+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_off00012036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12036 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13848 17720 bytes
SHA-256: e251c5f419f65fb1fa21c39033be085de3f1aab928bc5427a4d0d5df8c2ba688
font_02_sfnt_off0001664b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1664B 11032 bytes
SHA-256: 8f33dc09df8522f22fbfcdaf1281198d120f550ef2c6a5cb5b98d1465f2bb907

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