Malicious PDF — malware analysis report

Static analysis result for SHA-256 891daf5b495694d5…

MALICIOUS

PDF

78.6 KB Created: 2021-09-15 14:26:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4f7d70db2f4ee7f435dd1d393bbf5c2a SHA-1: 20464769f9d23ba3a9cac97162f56eb9e61d90b2 SHA-256: 891daf5b495694d51b6dd6ade31b3606d4bf4c17cce38660a5b538818c186a57
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest this PDF is part of a link farm designed to redirect users to potentially malicious content. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://homeshopeez.com/uploaded_files/userfiles/files/83371403050.pdf In PDF document text
    • http://anhhieu.vn/hinhanh/file/xuvidigi.pdfIn PDF document text
    • http://tai-group.com/upload/files/73795577086.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/4sl0kcl0s12d5htrm64dk74lif/61794345183.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/55343432035.pdfIn PDF document text
    • http://tieulongcopro.com/luutru/files/fogudegoronuvanebivin.pdfIn PDF document text
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210907_48E42C472C11C881.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/6g104cqgt7lqo846jb8c1pq296/99283695174.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/e95d982d754d74b4688d5fc5c032d9c3/balezibeganejareru.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/tefuvifinotugigakopapi.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/mupajixozijijomomasokuta.pdfIn PDF document text
    • https://adminico.nl/userfiles/file/64978097997.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/jn1l213459ktpi03g3qu44v676/movofukajufunovo.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/nukisudenalijofififuvo.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/retatugowes.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/51165330178.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/najagikikewusubiwi.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/mixuvukezuxan.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/aa063cd3ecc6151e10c67c0c94b495ed/20734037077.pdfIn PDF document text
    • http://megalaserasia.com/upload///tujizotezuxen.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/9696a1e99ae9eff3e09d3b8feab22fbf/86270898246.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/momimimare.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139defb3a30b---56903616624.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=demon+slayer+movie+dubbed+watch+onlinePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD73 11140 bytes
SHA-256: 4847ae5f69db0a2db833ceeedc73f0b290905f0c20c72b96fa0c27c6a1399079
font_01_sfnt_off0000e75c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6E 17424 bytes
SHA-256: 930ab7012db80eeca57dfc715d9da6e01ac73cb5c4f01764ec611a83695f971d

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