Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc3d5fd3921f928c…

MALICIOUS

PDF

87.9 KB Created: 2021-09-04 04:05:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 748a5503bc697963b379bc229f5cc1a7 SHA-1: d07f74dc54ddce005497794d550757b0ee179494 SHA-256: cc3d5fd3921f928c477ab92a7d8be2a01ea0c1eb6de76ff922c0119d69def4ad
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded URLs, many of which point to compromised or disposable domains. This behavior is characteristic of a link farm, often used to manipulate search engine rankings or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness, supporting the assessment of a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://weborder.cloud/userfiles/file///metewavagarowinurawigava.pdf In PDF document text
    • https://ratsimae.eemedia/contents/file/31966496204.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/vatobijunojamoroz.pdfIn PDF document text
    • https://menu2uplus.com/images/file/26470679635.pdfIn PDF document text
    • https://telenovella-bg.com/files/8093157831.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/dazimizazaz.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/acec0bda56202506ce1bf4990330da70/31552313278.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160db7276ed943---92352625171.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/gasuwaw.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/5e81351216a0baa6ca70c112dd747b59/76433148277.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/ff1ljq9ugbuu54ja28svuv935c/33838665719.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa8fa3c3d04---xutipetidim.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607983e0b2c75---fodejevetesililus.pdfIn PDF document text
    • https://www.shropshirefurniture.co.uk/admin/ckfinder/userfiles/files/59445983497.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/auskkgrivan7kp2fj72gte11r6/toxoliposezuz.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/padovir.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/374d9a07442af0087052313da600009c/86047657379.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf837e79372---15637690700.pdfIn PDF document text
    • http://xecuoihuyhoang.com/uploads/userfiles/file/zupotubomoxake.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/madefalegasulomene.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=shark+professional+steam+mop+s3601+manualPDF 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_off0000f25e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25E 11404 bytes
SHA-256: 7b181f2c319249121461ab1ce2fa0c17aa9930a298a340a94c5f23f6089e3a16
font_01_sfnt_off00010d21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12533 17332 bytes
SHA-256: 251a29fc970f47cedf7e5023d415ad82858915d8252a859716b5b84620ceab48