Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c1626763fd9d849…

MALICIOUS

PDF

91.7 KB Created: 2021-07-16 02:05:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 1dba5140ca0d6abad37efaef415a7971 SHA-1: 487084d17bb16e6d25e2c1d806058721e9068477 SHA-256: 5c1626763fd9d84942d3df21563cae39d0f882ab7d27d26cf2a19e5d8f3fb38b
96 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to compromised WordPress sites, likely intended to redirect users to malicious content. The ML classifier strongly indicated maliciousness, and the presence of multiple distinct hosts hosting PDF files suggests a coordinated effort to distribute malicious links. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073edbf4ff28---fofazegawutupopeja.pdf In PDF document text
    • https://torbay.ru/images/uploads/file/goposovojejuzajam.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/36c5b3e72f8227aadf969aca27bed86e/zujajadilozanup.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/filaxupapomoniwabalesoxud.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c2f842973---femelonugizirolawabufu.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096df4b0068f---sidusuwisozolululojizotaf.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/bo5vam275r6aifotdra9cmpac1/zomexegitom.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607097ed0275d---sufinarubevalewenuzoge.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021042908491834.pdfIn PDF document text
    • https://w4house.eu/file/tikojisujenipixiwinu.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/259973603.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/2ae9615ed6d9c6d231f1a7887b5ee1c6/raxed.pdfIn PDF document text
    • http://kotolantopeni.cz/file/datowiwinozavemajazi.pdfIn PDF document text
    • https://forthepeoplegov.com/userfiles/file/13663061321.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bf51c900f67---monofuwame.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803351a5ab7---fikutomifomuwaraja.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb6466c88b---pazeseguwunenaj.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/97610524722.pdfIn PDF document text
    • https://geniodelweb.com/file/guzobadev.pdfIn PDF document text
    • https://keluargamimpi2.com/contents//files/14145178058.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/dosaguzixe.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/5856275541.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/bubepurolalobokuzodovogow.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f9cea5b27---43837122007.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846dda6b5b1---zawatadijazuwumuw.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/72783f53f84420b28284416404a19e1c/kuleto.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb2744ef97---28403882738.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=best+italian+dishesPDF 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_off000104e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011cf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF8 10180 bytes
SHA-256: 8841bf6288971b78b1a5058c927519591c101620a00e4698bf5bb87014bfc5b1
font_02_sfnt_off000133a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133A5 17768 bytes
SHA-256: 65b9c12687bbc065c46f411952f76c0c86ecdb42c6f91fd63103c3cd9c3c5ead

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