Malicious PDF — malware analysis report

Static analysis result for SHA-256 6615203a20a96b97…

MALICIOUS

PDF

92.6 KB Created: 2021-08-17 02:02:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 036d83a7fd5fae74b896885e5814a759 SHA-1: 03c0c44f6746cdb953ee77c4f7b5ea2fa663e1f4 SHA-256: 6615203a20a96b977560b1231d5832d0bd0e525dcecf75983e0086028ae874ca
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories and disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a6f73e8ab---55165143177.pdf In PDF document text
    • https://prtl.pl/userfiles/file/75499858417.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/pml0bivjk94dl8icqk0vj7fbum/32530542780.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/25986478000.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/44601700617.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/2903280889.pdfIn PDF document text
    • http://aimic.com/userfiles/file/dorikapedavidarib.pdfIn PDF document text
    • https://www.visitrwanda.com/wp-content/plugins/super-forms/uploads/php/files/2fb659c5f53775345b452c30336a1b00/75380060806.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/37484043567.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075ec3881b06---35411585815.pdfIn PDF document text
    • http://biotledlight.com/userfiles/file///75283153498.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/9c4b876fe4c77f415a455da2a793fd1c/liwefabibadigexonol.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608aae5f8aded---razokuwosumabip.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/59342378487.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210627_C698766EC4733A55.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/65720150067.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/38536740996.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/59368601647.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/zukaxo.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6abc5e071c---wozisosewalizorejafor.pdfIn PDF document text
    • http://simpelms.nl/userfiles//files/lepumezamokujirapinotiko.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///74804723841.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=super+trainer+apk+modPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7A 18360 bytes
SHA-256: 7f4e43c063651ef07595208f6adcfbef3da2336158130b295fb236131454b56d
font_01_sfnt_off00010d28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D28 10604 bytes
SHA-256: cd26be7701c7ff4a093d43340d497b2a5ea15a9b5dfc8071069ec4530a0c3d14
font_02_sfnt_off00012555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12555 4028 bytes
SHA-256: e0e7f087d570e736c408ca01f1187384062ea60ab335d76d652ed160107caf94
font_03_sfnt_off000134d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D1 16272 bytes
SHA-256: 6db0f6aff302517959e771341526719c7cb0bccdb624e9d69e423217ff3f1916
font_04_sfnt_off00014ae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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