Malicious PDF — malware analysis report

Static analysis result for SHA-256 a315fd95f214b2bc…

MALICIOUS

PDF

90.4 KB Created: 2021-09-06 08:44:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 125f6fd870a70ff3825e212311e2cca2 SHA-1: bbb363f3d45448eb3a344f857990c94c56cd4806 SHA-256: a315fd95f214b2bccca7cd0068c3f4d9bad9acc6c21afa20cff02e67e2af04d6
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links to external PDFs hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://novussiteyonetimi.com/uploads/file/56690703175.pdf In PDF document text
    • http://www.tekkoo.net/images/library/File/xigifatupanofujaveb.pdfIn PDF document text
    • http://china-miyaco.com/img/file/202166231631.pdfIn PDF document text
    • https://vinniescustoms.com/userfiles/files/gogelanobiwida.pdfIn PDF document text
    • http://webinside.pl/userfiles/file/dokaziv.pdfIn PDF document text
    • https://yuktogel.com/contents//files/wixuberasawikevedej.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/raxujizile.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/e98a5ad928a543b34e3d273cf9158a1e/posarimafupikinitilar.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/ajuni3efonr79olm625it81f7m/divajuz.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210731_160915.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/07d9eb6c76089197d583725b9f78f3f3/vulozilenuvujeg.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/agsfjnnc4jgmvom41iu5fsfh11/zexivazojev.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/5562465024.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/96ffc3601438409d9a5539d88a253b9b/63657877590.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/satobilijukuxidobaroma.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/356e6a7df6f1f938733e78fb8adaf082/xolubejef.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/40996976430.pdfIn PDF document text
    • http://tauzetaques.com/clients/1/1b/1b95303171b4519794d6fee637ef680e/File/pasefiv.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/cc1a9aee3afe70c791144e64ec8ae9d4/zojanegiwefit.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/jamupexixi.pdfIn PDF document text
    • http://springhs1988.com/clients/a/a7/a70db2535ed58991dd9724faf9b165d0/File/69551294871.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210607081755.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0095dcc9c3---rugegasoxadafe.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/kebotufonunikuxisugoxerew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=ordering+negative+numbers+worksheet+ks3PDF 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_off0000f51f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51F 11328 bytes
SHA-256: 2b206669a120fde5c8610adb3c66a7dae71d2f7465dddd3459c1c59012415f9c
font_01_sfnt_off00010f7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7D 19748 bytes
SHA-256: 8acbc30eb9d6329406c45df7be81af6fb8bda8298c482356c552087f74c16185
font_02_sfnt_off000143cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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