Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcbf36b8f2817bff…

MALICIOUS

PDF

96.3 KB Created: 2021-07-22 21:00:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a2417aeb95f0d1100d522d202b41afdb SHA-1: 3d0db3c23dfb863e3a76eb2eae1c8e7ba12df2dc SHA-256: dcbf36b8f2817bffbb62ca1cf31ad79abc98f303f33d33ff8bc79df5be30b185
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/e66301f66d354a7be817b75f5652aa19/36594685661.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9cbcbf1aa---kefunupomiwigijetavimilur.pdf
    • http://ayhancevik.com/images_upload/files/wigefixawobu.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/5dshf5q8bd5u1dpih3np47rqt7/70529715085.pdf
    • https://fiberglasssupplydepot.com/userfiles/files/tosinorunodazekegowaxura.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/99d1f8176826d1bf25a6811288427b7c/gebimodipomuwabaxa.pdf
    • http://morgancountyoh.com/userimages/92826590319.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16076e73e4cc4a---17472009944.pdf
    • https://fishuntpesca.it/file/89590524125.pdf
    • http://birnagarcollege.in/userfiles/file/pawusiledoridogojosa.pdf
    • http://springbook.no/files/8323457993.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/aqm6faftgd6ofht883qtk70ns2/wemuropololekekonetopig.pdf
    • https://manuscripthandler.com/userfiles/file/88582680059.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/6ue9rnbaqj1nhkuu0bn70vil01/vemazujes.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9369b7260---wojogis.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/ef92fbfc4af9ebca709a43893183d44e/98566735628.pdf
    • https://dianthusindustrial.com/resimler/files/10076011855.pdf
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080419dbe04c---dubamilevigisafare.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/a81a726e65546c57162065af61d06c37/38567331097.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/c59550bbc1ae9987514d447f79885512/3355945831.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d6496de65---43913296323.pdf
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/munsn8b2ofm7msg5n0jpo6sft6/28567590633.pdf
    • https://tonwen.org/userfiles/file/45877498285.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=can+you+drive+out+of+state+with+a+temporary+license
    • 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_off00011210.bin
7cb409ff23a25e8ce7982f8d8fa26bcb9dfa696e83cc033daa1225a4c9a45134
pdf-font-stream PDF embedded font (sfnt) at offset 0x11210 17296 bytes
font_01_sfnt_off00013ed4.bin
937d418ed3101b04aca1f00b6536a8fc261fff07d0253bf30b9c1c9ee7f5f4b5
pdf-font-stream PDF embedded font (sfnt) at offset 0x13ED4 11284 bytes
font_02_sfnt_off00015940.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15940 16792 bytes