Malicious PDF — malware analysis report

Static analysis result for SHA-256 245022484d4d5e32…

MALICIOUS

PDF

87.2 KB Created: 2021-09-04 06:47:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 197d234d20020e9ab89a0ad6219f07b8 SHA-1: 2ad7d38a213f119f62335437903cd1de7f71da0c SHA-256: 245022484d4d5e329a5335db7f48d8d7bf6c2b33f67ed2d01620cfb6f0da0e72
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites. Several heuristics indicate the document is part of a link farm hosted on compromised or disposable domains, suggesting an attempt to manipulate search engine results or distribute malware. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://farmaciacogliate.it/userfiles/files/39106914935.pdf In PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608da579aca6b---zudusazapogadonaruzexukew.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/zupovomodasumi.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5480634614.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/ab94daeb15731d1632cf0a0cb5ad77a2/jotuvudelepajepuwosetu.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/a6c4b25769da10e06c55aa946108fea2/gepozawubaxa.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/si70l0kdmn47d77dr7tefr1g1n/44332634766.pdfIn PDF document text
    • https://vinacoma3.vn/userfiles/file/40816777600.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/49812069396.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/49a2ba864beb8f10afe7771b8057f1ed/52407852509.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/b25675554ba69ed7db5cf2e4f9352fa6/72814814667.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/zedexub.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3aca84cde2---dabekezavugogujun.pdfIn PDF document text
    • http://thephinhmienbac.com/upload/files/temubamisoz.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/ed12ol9gfaeeajvjkeaksqm7g0/44869017550.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/57918446077.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/18523538795.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/71906035826.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/xajuwog.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/a484daf802c13da956455f7df3338303/41493004957.pdfIn PDF document text
    • http://armanetti.com/images/luxojifig.pdfIn PDF document text
    • https://brickbodysupplements.com/newerac2c/userfiles/file/lovanus.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/b6d62deb8dcc290b09f2f73732eb1bd2/7242475800.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/zilagasemomofiput.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=cbse+class+6+math+pdfPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/88b99f65310dc5c127785ca86844655e/jeruwodazonakapunoxoni.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_off0000f045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF045 10808 bytes
SHA-256: b3640fc990dd1006c5ecb4471ab6d7090b6b22e887db1e9fe64c42ea0a18578f
font_01_sfnt_off00010909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10909 17876 bytes
SHA-256: 1974a33b799398358ec21a26a99e6d9aee30a3e1bcfc9a8285759ef6a5a6affb
font_02_sfnt_off00013754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13754 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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