Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f5b2cec9dac0af3…

MALICIOUS

PDF

91.2 KB Created: 2021-08-30 14:29:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 85880eab800953c34edc27cd242a3b7b SHA-1: 82ff5b9ea794ff6cb1abcad143026220ce9b746f SHA-256: 7f5b2cec9dac0af32332f8a3da8519f2bc2dd764024ee647237bb5d7d74b54d5
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable domains, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious, and the heuristics suggest it's designed to leverage compromised CMS uploads and disposable hosting. No scripts were extracted, but the structure and URL patterns are indicative of malicious intent, likely related to SEO spam or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://vogiantinhmach.com/media/ftp/file/mufatodewodumaje.pdf In PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/31526790816.pdfIn PDF document text
    • http://ehs1958.org/clients/73155/File/89574113922.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3adf84c4f0---famuto.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/56843343017.pdfIn PDF document text
    • http://natproperty.com/userfiles/files/puwemesezimesew.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074368c08a3e---91231811008.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/94568418862.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160982e7687379---mawuwebogagavamu.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3b6834b21---wutebarafabijuluge.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/h8vcm1lv93dl9eld26elgj1q25/70805744030.pdfIn PDF document text
    • https://manorhair.com/uploads//files/202108131053093147.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/782b6478e28f10bd00d32aee790372d8/fogoruzepupuwutudotafuw.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/tigodufujite.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/kepefomewuge.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7b94d6ad0---88376238116.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fe9432f2c---dufagedu.pdfIn PDF document text
    • https://hideab.se/tc/Mediagalleri/file/fapirojubulovobudazuz.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c03a967aa---bafoge.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/e249eb46a8f1bd729ab99f312dd1825b/regifinikemudeziwaxenu.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/ck7ksg86mg7oioamd78ef6405e/fezexijatologanatoxaso.pdfIn PDF document text
    • https://emprenderem.cl/files/44740567307.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612076d37faeb---36229449389.pdfIn PDF document text
    • http://fitviewer.de/files/file/20577557750.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/49779405837.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/79094678660.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=types+of+motion+with+examples+class+7PDF 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_off0000fa4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4D 19444 bytes
SHA-256: 68240e664ef883828e313362ca12fcf236bd790d50f7a9fb7bc9157a8603d087
font_01_sfnt_off00012d6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D6F 10960 bytes
SHA-256: 4da68cb613c7e5b9c5fd2e4d8155815db5693d3b1aa011729e6662b70843615d
font_02_sfnt_off000146da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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