Malicious PDF — malware analysis report

Static analysis result for SHA-256 11b6529282638956…

MALICIOUS

PDF

113.5 KB Created: 2021-06-28 23:47:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7a84c7df5d1606e5becdba635fbc9392 SHA-1: 810b1591dd86cd67eb67d3c355de6b7f83e1e1c3 SHA-256: 11b652928263895645f38808dd56543435791f671498eebca1e0e4ab6197d4b0
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories, suggesting it is used to distribute further malicious content or redirect users to phishing sites. The presence of external URIs and compromised CMS upload links indicates a likely attack pattern involving redirection to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • 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.
  • 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.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfd90a88bb---31014270787.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4c464cc862---wenawurezipetowelinivep.pdf
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/2vum8ujcpgg0avtn5hfmpmsgkv/53394949663.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607f01a42e446---lovemunepifubijaje.pdf
    • http://takeacode.eu/user/d41d8cd98f00b204e9800998ecf8427e/file/30567533296.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/19852710193c4da7816ee71d208c297f/pipugo.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a5376b3e3---temadi.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090c72fd5f4a---jezuxemugonotesagiwegaf.pdf
    • http://alanaf.ru/userfiles/files/64550181882.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/36887fd9c1fae2fcc4d7a93120af4862/pajinesaralanagukum.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/77ul9fcek0c5ags70rl8bljoiu/56659171713.pdf
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/e25d825662d374db7064f28aa5aeb7d2/repekisunuxit.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb78dac3c5---97652744204.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c9326540780---dulibexe.pdf
    • http://alnoorcity.com/userfiles/file/42827184908.pdf
    • https://hagepoorter.be/files/files/94054813346.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/1mqt8074bhuund8psd5f5tagv9/1476282435.pdf
    • http://facilitymanagementassociates.com/survey/userfiles/files/gilivafine.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d9bed2f75---sojesivewujapipod.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb79784f85---54712740581.pdf
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/3e2fecd497edc0c68dd4e607eb2bb8a0/dedaperirazotajuv.pdf
    • http://incucinaconalberta.com/userfiles/files/21871370686.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=cabbage+belongs+to+which+family
    • 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_off0001568b.bin
6176def9049fe5fbf709d392a1ce26001bfc81e6c5ede53f7a2c545bf7a8bcae
pdf-font-stream PDF embedded font (sfnt) at offset 0x1568B 18932 bytes
font_01_sfnt_off00018716.bin
83e6fc1e6b0572fa8f3e7de265c8c838140087f6bebf1f82d602286fddabb2d0
pdf-font-stream PDF embedded font (sfnt) at offset 0x18716 11052 bytes
font_02_sfnt_off0001a0c0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A0C0 16792 bytes