Malicious PDF — malware analysis report

Static analysis result for SHA-256 800c5bb1e2b7d146…

MALICIOUS

PDF

98.7 KB Created: 2021-06-26 13:08:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8642448acee6088ee4a4edf23bb0e533 SHA-1: 724063b94e1947c61ff6c3ab14deec4bcf9cc639 SHA-256: 800c5bb1e2b7d146c1a4c6259b993b8f8dc42da619b36cdadaa339a38a437e10
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The document contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to redirect users to malicious content. The presence of numerous unknown URLs hosted on various domains further supports this phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1a17cc4bd---45845134631.pdf In PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d007460ba86---zopozodukisafibode.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b926cedfc---vikemujekodigibumiruga.pdfIn PDF document text
    • https://123natura.com/stockages/files/bejuz.pdfIn PDF document text
    • https://ilcaminodaugo.it/file/nosugibujibad.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/59075714675.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/11016315015.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/37380353824.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790e7c660d1---silakewatoxabisak.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712abe5a5d3---95861030900.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afa7a407ba9---64038216382.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608325c492bc2---91942286953.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/6c87f99a9aeda308311264da5d1139c7/gidob.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/afe9a5fdf93f72e2591cf08c01b48c1e/xozomuriluro.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4f38b3dbdb0143d368e7326403a041af/97749311701.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/dawisudalavedumudim.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160785a6a5ef36---nokamobaja.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/mifuvagalu.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/la5mclaiupmchdngtjpg950mu4/fesabopasisusamivepijukeb.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/xumapar.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/cvaak25c5j0dtlk37tnhgakut0/20653130044.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f49e000b2f---10965105762.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9564ae917---21086834959.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/188227f22a7f953645d1516ceff6e7c2/sitadarudubupakoduvaweb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=as+per+your+request+meaningPDF 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_off00011d7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7F 10888 bytes
SHA-256: 226d46dd87fdd6c69e06638c0033e0a211154354247f98f6f52491b859c182a3
font_01_sfnt_off0001366d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1366D 18032 bytes
SHA-256: 5908988e501a81f754036266588402de29e55da3dba18a8c1042ce03a7a14960
font_02_sfnt_off00016562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16562 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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