Malicious PDF — malware analysis report

Static analysis result for SHA-256 a809e9b77a5792ed…

MALICIOUS

PDF

87.9 KB Created: 2021-07-03 12:14:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 02505812569c07029a54d2c4d57eb075 SHA-1: 814bf6e615407289b0c61f77b7f55ba74ae1bcc8 SHA-256: a809e9b77a5792ed9a9016d430ca932a572ecf2b8d4096b121e9a0a061e90fbe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as 'Pdf.Phishing.Trojan' and flagged by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised WordPress upload directories, suggesting a link farm used to redirect users to malicious sites. The presence of these links and the overall detection strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2987cf4f1---gamajajawebijulije.pdf In PDF document text
    • http://africareview.in/userfiles/file/58501874900.pdfIn PDF document text
    • http://zzweien.com/d/files/36956665990.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1713e76b0---39203218901.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609679133beff---42192847788.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727bd0ba067---nesafijumebifusevokerimap.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab88a710f00---wumoj.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021511322413076.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/9725b14ba1b55eb7c7a5ece2e5ffed63/selifibeze.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/f78bf27ac2d67f9b2b00951f227e2e9e/jupogufimovoferesexafokat.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/r0dho65cdahek6ts9j514fmcjl/75185548751.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/60f593629fdcf35b4ea563c7a29688cb/penevuseg.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/rebezafurizuxipusituvus.pdfIn PDF document text
    • https://istanajpdua.com/contents//files/89615843286.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608587e3ed3ab---20613192125.pdfIn PDF document text
    • http://www.moyekolodin.com/files/gozoboxegos.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/2a31eecdb1b98827c1705e6108f2d299/96755183518.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/b7c4v74fi6j9jb4mgn3rssh47j/98509116644.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160dfb9b002fb3---vawig.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160893a788fc37---95605885617.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/kozote.pdfIn PDF document text
    • http://amandamaitland.com/images/file/mafajokireri.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083051444999---86281991970.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16073ba7251f94---46096442729.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+screenshot+someone%27s+storyPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/73704144196.pdfIn PDF document text
    • 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_off0000f39b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010bad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAD 17784 bytes
SHA-256: d0a16955838659b3b91d379c497abd3352a18ff5e5ee22dd39b568700b626cac
font_02_sfnt_off00013a7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A7A 10420 bytes
SHA-256: 83c58b00cede06d4b61db65e04155c9210da0771edc86e2eb665ea49404d71cf