Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbf1fd9ca0106353…

MALICIOUS

PDF

102.6 KB Created: 2021-09-20 06:55:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: eb87fb13578af30dd3ebabbf3f86b9a2 SHA-1: b8c6ed8d0a3eaf04a18b98fdb2e94dd293ef430a SHA-256: dbf1fd9ca010635382454f53160e980abc00d6307fb5b7b03ff8fa121a1af998
96 Risk Score

Malware Insights

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

The PDF file contains numerous external URIs and link farm heuristics, indicating an attempt to redirect users to potentially malicious websites. The ML classifier strongly flagged this PDF as malicious. The presence of compromised CMS upload links suggests a pattern of hosting malicious content on seemingly legitimate but compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://drafthe.ru/uplcv?utm_term=kung+fu+panda+3+full+movie+hd+english PDF link annotation
    • http://terezmisszio.eu/files/file/xezifizigegorifi.pdfIn PDF document text
    • https://matrixx.lu/images/42658748914.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/79286109391.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614146a71cf2e---84258796314.pdfIn PDF document text
    • http://skene.es/userfiles/file/32768598067.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/xulevexisegemog.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/mumilafegojugizakif.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/29grhipcurf2vrjralu793q22j/vukuzul.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/1576168330.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/lemir.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/810814d755b25ac692a6c73d2e169eab/xuxirapupim.pdfIn PDF document text
    • https://caraudioshop.ro/mm/file/foruporakep.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-7/20210907181331622142.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/49353269546.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/9mncvd809s10h35v89bt4utd9k/magasupebepobutokefolav.pdfIn PDF document text
    • http://annabarons.lv/files/files/semezivifawosevuriful.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/71487141795.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/vadafidejidivalosudonaxex.pdfIn PDF document text
    • http://runhouchem.com/upload/files/mimazobumupe.pdfIn PDF document text
    • https://profesa.net/userFilesfile/57262247588.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/32086599156.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16146cc006ce58---41372586083.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614241409f30c---49656774198.pdfIn PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/padulibajefotezupaw.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_off000128d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000140e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140E3 19340 bytes
SHA-256: 2586da57492e358ad9adf3b6bcb9a1953f5280ab4dbee3dfcb020ffd028b8745
font_02_sfnt_off0001737d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1737D 11076 bytes
SHA-256: 1bdc39a998cfc0735aef3694a8823fb4898bc74e6f5b5c6c0777f3ec7566a379