Malicious PDF — malware analysis report

Static analysis result for SHA-256 216a5f807b02ffce…

MALICIOUS

PDF

84.7 KB Created: 2021-06-06 11:43:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: a5d5893a2eb354929fa6b4e6ad037ba1 SHA-1: 9cc7b68537a54988de96bbe116240beaf04ce0e6 SHA-256: 216a5f807b02ffce3f448facbfe5b82a3667d71465aa6b78cf9d9d82871aca45
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed for phishing or malware distribution. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs further supports this. No scripts were extracted, but the overall structure and URL targets point to a common tactic of using seemingly innocuous documents to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://catamma.ru/uplcv?utm_term=arabic+verb+vocabulary+list+pdf PDF link annotation
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9993396be---viwat.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/28109731860.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/aut6u4l70tl3ap4v3ghkepcf5j/65373390643.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd921cc8e1---80682705300.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/70452727839.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/xuxabawopizatil.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/cb094dab173fb280e23baae82ac0c7d2/39373700358.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/72639370715.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/2f1323ae2a8781ca29f4c3af146219c3/71725848562.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/94397279874.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/87604836767.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/83068683770.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/ds5o7pnk7clhjedn80iqj5u56u/3925654212.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a95b8645976---92811461746.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aabddc8d9e---janir.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/9455ba90ef89cae70615875362bfcdc4/pulusuxojot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00011097.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11097 29456 bytes
SHA-256: f338924b0bb6fc41aaac13ced502ccc54e4edd1e0b161ee45ffb4afbed5e1fde
font_00_sfnt_off0000d9c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C2 5440 bytes
SHA-256: 16b3a3f413e3d9b294668d881a6b8ea5af85c4e54f010a2de6ab3fc8a73adb3e
font_01_sfnt_off0000ec5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5A 10604 bytes
SHA-256: 79b2dbe239711cd223f1a9f880b5b4de88ad336983d989d5095ff76163fc846c