Malicious PDF — malware analysis report

Static analysis result for SHA-256 9735951cf0117da5…

MALICIOUS

PDF

87.0 KB Created: 2021-06-26 03:41:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b100f7785c127ee9966b7923eef26526 SHA-1: 757056ad00f1b2ef743885a3e328d5645f90d8b4 SHA-256: 9735951cf0117da5f30da077b214f2aa7f08b6576e829a70a55cf0989b169212
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple URLs hosted on compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of numerous links on disposable hosting and compromised CMS uploads further supports the classification as a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c982c612e2---93927067616.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/ruccc5ce8cvk49g35cteb7cvc7/nafivajubujazekotogumu.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a397e4382---fanikakuwafobis.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607279acb1d32---wenepajivobifovufomanef.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16098af857f59c---54640577671.pdf
    • http://meadescafe.com/userfiles/file/7098120682.pdf
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/c7be2033bc791b789da45aeecf079e6a/16717574528.pdf
    • http://teranor.com/ckfinder/userfiles/files/bulesifop.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079398056fd3---42521698215.pdf
    • https://tortugafilms.ca/adminfiles/file/25904692893.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/d6gglpe3g5mukkrq5euc740irv/ponaselozimifolijodike.pdf
    • https://press-centr.com/images/file/18275875893.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/6c72aebfc1c233c38c4dddb9eeecb904/jolofatos.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/541854d15ae7999b0564bb6bec577e36/21877981474.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7de0e5289b82c895e1e027cad46c2f61/samij.pdf
    • http://akcjonariusz.com/UserFiles/file/79004917578.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/o73s2aum4ppee9oirqdugj3j64/39809929904.pdf
    • http://gazosilikatnn.ru/uploads/files/juwunesagonomuwabitavob.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160967ea0c8d08---12408380159.pdf
    • http://aceonlinementors.com/userfiles/file/vuzejar.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/0cb6df3e006b63a6d7818b2320abcd03/55271759774.pdf
    • http://andreaslasnik.com/data/files/pofomomoximoseniwa.pdf
    • http://adirondackseafood.com/ckfinder/userfiles/files/30049249200.pdf
    • http://alliance-ltd.com/userfiles/31436642622.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=example+of+step+migration
    • 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_off0000f0cf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CF 16792 bytes
font_01_sfnt_off000108e1.bin
169ac18d83d0ff9605384b48ae14049392e8bd499549826316f6694f163531bf
pdf-font-stream PDF embedded font (sfnt) at offset 0x108E1 17312 bytes
font_02_sfnt_off0001362b.bin
44c4f3910cb9cd2e2fcea4b5ea06d59581efd7b5fa1f68fff8fc33874daec0b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x1362B 10784 bytes