Malicious PDF — malware analysis report

Static analysis result for SHA-256 d93175f741f62fa0…

MALICIOUS

PDF

90.4 KB Created: 2021-08-23 14:41:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2d1c9ad37c5efd863f47f12704ad20fb SHA-1: 9c56f32e2246d967ec32da2925c630e190c1c0fc SHA-256: d93175f741f62fa0872460f486fd71f2f6f02e2fe76a9a6180e8738282ea3da0
164 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to distribute malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous links to potentially malicious PDFs is a significant indicator.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pnp-studio.com/fckeditorfiles/file/farob.pdf
    • http://maraulsan.com/ckfinder/userfiles/files/87298489903.pdf
    • http://nicenpos.com/userData/board/file/kifamanowovinexovarux.pdf
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780064496ee---mebaxifozabefeluxebuxivot.pdf
    • http://booklandbooks.com/userfiles/file/dejogirurivezusenivigo.pdf
    • https://gretajensen.com/ckfinder/userfiles/files/nebijur.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16070082cb9c88---663513225.pdf
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/fb129d9a6f56e22e6457591690a498c6/80191347458.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/6a6604947c313ad663a739470b85dd86/kofeludasudewojalibune.pdf
    • http://petra-dario.info/upload/datoteke/jasunubunikike.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f06d27f7ac---50136078682.pdf
    • http://nedirajtebosnu.net/userfiles/file/sokewinezod.pdf
    • https://hbphoto.ca/resimler/files/99900402918.pdf
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/bdd2jqn62ufeqfbduudfhs10e0/89585767265.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609e65c2b64f0---22502114709.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddabdb2597---tesaro.pdf
    • https://alarrabnews.com/images/content/content/file/lexidebubuxiloso.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dphgr17p2hes9r3o86310tr6c5/65192204651.pdf
    • https://parfumzone.ro/files/file/55202862903.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/iejisod87chkl5ldolgheo7dg6/tivizavefilezafomo.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b800f7c4118---39725640268.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f35053acb---55790308570.pdf
    • http://health-bridge.in/upload/file/moxit.pdf
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/2mk5h1sg18e14irjbfrtqdn65r/1933081896.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcaa20648c---18553461381.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=upgrade+mi+box+to+android+9
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fedf.bin
66cdac714821127a50c94a2207d791eb8d6906a044902d4a30e545cab40feff2
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDF 17148 bytes
font_01_sfnt_off00012b1d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B1D 16792 bytes
font_02_sfnt_off00014334.bin
7aaa0cbd6504b5a3a6ccdd5ad74ef2af85f8c28b6609d4d6ead7ca419b697450
pdf-font-stream PDF embedded font (sfnt) at offset 0x14334 10936 bytes